MH-9483 -- modified EpisodeService API so no un-rewritten mediapackages can escape

git-svn-id: https://opencast.jira.com/svn/MH/trunk@13964 e6edf6fb-f266-4316-afb4-e53d95876a76
MH-9435 : The license field is now populated correctly

git-svn-id: https://opencast.jira.com/svn/MH/trunk@13965 e6edf6fb-f266-4316-afb4-e53d95876a76