Fix example pipeline: no such property: discoverGitReferenceBuild

[KasperHeyndrickx]

this fixes the following error when trying to run jenkinsfile.analysis

Groovy.lang.MissingPropertyException: No such property: discoverGitReferenceBuild for class: groovy.lang.Binding
 	at groovy.lang.Binding.getVariable(Binding.java:63)
 	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SandboxInterceptor.onGetProperty(SandboxInterceptor.java:270)
 	at org.kohsuke.groovy.sandbox.impl.Checker$7.call(Checker.java:353)
 	at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:357)
 	at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:333)
 	at org.kohsuke.groovy.sandbox.impl.Checker.checkedGetProperty(Checker.java:333)
 	at com.cloudbees.groovy.cps.sandbox.SandboxInvoker.getProperty(SandboxInvoker.java:29)
 	at com.cloudbees.groovy.cps.impl.PropertyAccessBlock.rawGet(PropertyAccessBlock.java:20)
 	at WorkflowScript.run(WorkflowScript:11)
 	at ___cps.transform___(Native Method)
 	at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.get(PropertyishBlock.java:74)
 	at com.cloudbees.groovy.cps.LValueBlock$GetAdapter.receive(LValueBlock.java:30)
 	at com.cloudbees.groovy.cps.impl.PropertyishBlock$ContinuationImpl.fixName(PropertyishBlock.java:66)
 	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 com.cloudbees.groovy.cps.impl.ContinuationPtr$ContinuationImpl.receive(ContinuationPtr.java:72)
 	at com.cloudbees.groovy.cps.impl.ConstantBlock.eval(ConstantBlock.java:21)
 	at com.cloudbees.groovy.cps.Next.step(Next.java:83)
 	at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:174)
 	at com.cloudbees.groovy.cps.Continuable$1.call(Continuable.java:163)
 	at org.codehaus.groovy.runtime.GroovyCategorySupport$ThreadCategoryInfo.use(GroovyCategorySupport.java:129)
 	at org.codehaus.groovy.runtime.GroovyCategorySupport.use(GroovyCategorySupport.java:268)
 	at com.cloudbees.groovy.cps.Continuable.run0(Continuable.java:163)
 	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.access$001(SandboxContinuable.java:18)
 	at org.jenkinsci.plugins.workflow.cps.SandboxContinuable.run0(SandboxContinuable.java:51)
 	at org.jenkinsci.plugins.workflow.cps.CpsThread.runNextChunk(CpsThread.java:185)
 	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.run(CpsThreadGroup.java:400)
 	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.access$400(CpsThreadGroup.java:96)
 	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:312)
 	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup$2.call(CpsThreadGroup.java:276)
 	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$2.call(CpsVmExecutorService.java:67)
 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:136)
 	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)
 	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:59)
 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 	at java.lang.Thread.run(Thread.java:748)

[codecov]

Codecov Report

Merging #810 (8692630) into master (57fa6e2) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #810   +/-   ##
=========================================
  Coverage     80.14%   80.14%           
  Complexity     1560     1560           
=========================================
  Files           243      243           
  Lines          5660     5660           
  Branches        418      418           
=========================================
  Hits           4536     4536           
  Misses          968      968           
  Partials        156      156           

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[uhafner]

Thanks!