rollback custom boxes
added --force option for shutdown VM
Use poweroff command
rollback changes
Enable cooker && openmandriva2013.0 platforms
rollback vm.yml.sample
abf/rosa-build#276: updated Publish runner
Merge pull request #21 from abf/abf-worker:276-generate-additional-metadata
 abf/rosa-build#276: Generate additional metadata for Software Center