MH-9443 -- implemented a workflow operation handler that is able to republish metadata

git-svn-id: http://opencast.jira.com/svn/MH/trunk@13834 e6edf6fb-f266-4316-afb4-e53d95876a76
MH-9443 -- fixed an issue that would result in an empty set of elements if more than one flavor was specified

git-svn-id: http://opencast.jira.com/svn/MH/trunk@13835 e6edf6fb-f266-4316-afb4-e53d95876a76