[test and test-multi goal] custom junit report collector should add the project name to the testsuite

[redfish4ktc]

This is what is done in

• SoapUI JUnit-Style HTML Reports (see http://www.soapui.org/Reporting/junit-style-html-reports.html)
• this blog post: http://blog.infostretch.com/customizing-soapui-reports (used for initial implementation of our junit collector, see #42)

This is particularly helpfull when using several soapui projects in the same maven execution. It allows to quickly know to which project a TestSuite belong (expecially when testsuite have the same name accross projects). We could provide a way to activate/unactivate this (plugin configuration parameter, java system property, ....)