[MRM-1792] Integrate Apache Sirona Monitoring

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1540597 13f79535-47bb-0310-9956-ffa450edef68
move memory status on the top of the page

git-svn-id: https://svn.apache.org/repos/asf/archiva/trunk@1540598 13f79535-47bb-0310-9956-ffa450edef68