Fix SonarQube failure

[angelozerr]

If you see https://hudson.eclipse.org/tm4e/job/sonarqube/23/console SonarQube doesn't work:

[ERROR] SonarQube server [http://sonar.eclipse.org:9000/sonar] can not be reached
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] org.eclipse.tm4e ................................... FAILURE [  0.681 s]
[INFO] tm4e-target ........................................ SKIPPED
[INFO] org.eclipse.tm4e.core .............................. SKIPPED
[INFO] org.eclipse.tm4e.core.tests ........................ SKIPPED
[INFO] org.eclipse.tm4e.registry .......................... SKIPPED
[INFO] org.eclipse.tm4e.ui ................................ SKIPPED
[INFO] org.eclipse.tm4e.ui.tests .......................... SKIPPED
[INFO] org.eclipse.tm4e.markdown .......................... SKIPPED
[INFO] org.eclipse.tm4e.ui.editor ......................... SKIPPED
[INFO] org.eclipse.tm4e.samples ........................... SKIPPED
[INFO] tm-feature ......................................... SKIPPED
[INFO] org.eclipse.tm4e.repository ........................ SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 10.654 s
[INFO] Finished at: 2017-06-13T18:33:20-04:00
[INFO] Final Memory: 82M/2311M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.2:sonar (default-cli) on project org.eclipse.tm4e: Unable to execute SonarQube: Fail to download libraries from server: Failed to connect to sonar.eclipse.org/172.30.4.122:9000 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.sonarsource.scanner.maven:sonar-maven-plugin:3.2:sonar (default-cli) on project org.eclipse.tm4e: Unable to execute SonarQube
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
	at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:863)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:288)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:199)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
Caused by: org.apache.maven.plugin.MojoExecutionException: Unable to execute SonarQube
	at org.sonarsource.scanner.maven.bootstrap.ExceptionHandling.handle(ExceptionHandling.java:36)
	at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute(ScannerBootstrapper.java:81)
	at org.sonarsource.scanner.maven.SonarQubeMojo.execute(SonarQubeMojo.java:122)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
	... 20 more
Caused by: org.sonarsource.scanner.api.internal.ScannerException: Unable to execute SonarQube
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:84)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:71)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:71)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory.createLauncher(IsolatedLauncherFactory.java:67)
	at org.sonarsource.scanner.api.EmbeddedScanner.doStart(EmbeddedScanner.java:218)
	at org.sonarsource.scanner.api.EmbeddedScanner.start(EmbeddedScanner.java:156)
	at org.sonarsource.scanner.maven.bootstrap.ScannerBootstrapper.execute(ScannerBootstrapper.java:60)
	... 23 more
Caused by: java.lang.IllegalStateException: Fail to download libraries from server
	at org.sonarsource.scanner.api.internal.Jars.downloadFiles(Jars.java:93)
	at org.sonarsource.scanner.api.internal.Jars.download(Jars.java:70)
	at org.sonarsource.scanner.api.internal.JarDownloader.download(JarDownloader.java:39)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherFactory$1.run(IsolatedLauncherFactory.java:75)
	... 30 more
Caused by: java.net.ConnectException: Failed to connect to sonar.eclipse.org/172.30.4.122:9000
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.io.RealConnection.connectSocket(RealConnection.java:187)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.io.RealConnection.buildConnection(RealConnection.java:170)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.io.RealConnection.connect(RealConnection.java:111)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.StreamAllocation.findConnection(StreamAllocation.java:187)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.StreamAllocation.findHealthyConnection(StreamAllocation.java:123)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.StreamAllocation.newStream(StreamAllocation.java:93)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:296)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:248)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.RealCall.getResponse(RealCall.java:243)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.RealCall$ApplicationInterceptorChain.proceed(RealCall.java:201)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.RealCall.getResponseWithInterceptorChain(RealCall.java:163)
	at org.sonarsource.scanner.api.internal.shaded.okhttp.RealCall.execute(RealCall.java:57)
	at org.sonarsource.scanner.api.internal.ServerConnection.callUrl(ServerConnection.java:113)
	at org.sonarsource.scanner.api.internal.ServerConnection.downloadString(ServerConnection.java:98)
	at org.sonarsource.scanner.api.internal.Jars.downloadFiles(Jars.java:78)
	... 33 more
[ERROR] 
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
SonarQube analysis completed: FAILURE

@mickaelistria @pascalleclercq any help are welcome!

[mickaelistria]

We should consider moving to another SonarQube server (like the public SonarCloud instance) since the SonarQube provided by @eclipse foundation is obsolete.

[mickaelistria]

We've abandoned SonarQube