extract inner classes

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1551474 13f79535-47bb-0310-9956-ffa450edef68
[MRM-1746] build merged index for groups with a cron schedule
fix issues

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1551475 13f79535-47bb-0310-9956-ffa450edef68
prevent running in parrallel

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1551476 13f79535-47bb-0310-9956-ffa450edef68
add a nex flag to indicate the merged index is temporary

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1551477 13f79535-47bb-0310-9956-ffa450edef68