Retry VM start and stop actions that may fail because of transaction processing in HKD. Batch start and stop actions to minimize transaction contention.

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22185 4046b530-fbad-4e16-af16-ee11f0b55167
aufs backend was loading overlayfs kernel module

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22189 4046b530-fbad-4e16-af16-ee11f0b55167
vm propget was broken because of DBIx::Class generating an ambiguous SQL query, fixes #1434

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22191 4046b530-fbad-4e16-af16-ee11f0b55167
Use --numeric-owner when extracting LXC image. Fixes #1449

git-svn-id: https://svn.qindel.com/repos/main/projects/qindel/QVD/src/trunk@22194 4046b530-fbad-4e16-af16-ee11f0b55167