PIM-2919 : move versioning listeners
PIM-2919 : rename versioning listeners to subscribers for consistency
PIM-2919 : rename versioning event subscribers services
Merge branch 'master' into PIM-2919-versioning-subscribers
Merge branch 'master' into PIM-2919-versioning-subscribers
PIM-2919 : update the mongodb versioning subscriber
PIM-2919 : rename user listener
PIM-2919 : rename user listener
PIM-2919 : update change log
Merge pull request #1319 from akeneo/PIM-2919-versioning-subscribers

[WIP] PIM-2919 versioning subscribers