WINDUP-2260 Changes to have the tests to work with a remote RHAMT instance

[mrizzi]

• strengthened tests behaviour to work when the UI is remote so there's more delay in responding due to network latency and remote server performances
• added optional login action using -DwithLogin parameter
• added optional URL to call a remote RHAMT instance using -DbaseUrl=http://rhamt.example.com/ parameter
• added optional parameter -Dheadless=false to disable the browser headless mode
• refactored some method and moved them in CommonProject class (login, waitForProjectList, waitForNoProjectWelcomePage, waitForProjectLoad, navigateProject, closeDriver)
• added SeleniumSuiteTest class to execute all of the tests in the right order with just one parameter -Dtest=SeleniumSuiteTest
• updated version in pom.xml to 4.2.1-SNAPSHOT
• commented a check about sorting for having it fixed later

[PhilipCattanach]

I executed the tests several time using the remote upshift 4.2.1 snapshot build of the RHAMT Web UI via the following command.
mvn -Dtest=Selenium01Test#test05RunAnalysis -DwithLogin -DbaseUrl=http://rhamt-web-console-rhamt.cloud.paas.upshift.redhat.com/ clean test
I also ran the same test running the WebUI on localhost. There were no failures due to issues with the Package selection controls.

[mrizzi]

@m-brophy i changed the pattern to wait for the package tree to appear in the page: now it waits for an li element with class jstree-node that i really hope would be able to exclude the Loading... label to be retrieved.
Please, make me know if it works for you.