[JENKINS-18574] use main repo path in change log for svn:externals affected paths
[JENKINS-18574] use main repo path in change log for svn:externals affected paths
remove '/' svn log prepend to affected path so maven plugin can compare with modules
[JENKINS-18574] unit test to demonstrate the fix
changed implementation to workaround a constraint (bug?) in FSPathChange
[JENKINS-18574] fix leading '/' that confuse maven-plugin to determine impacted modules
merge JENKINS-18574 branch