Fixes #5986:  Eventlogs to track hearbeat change on node are missing
Merge pull request #725 from fanf/bug_5986/eventlogs_to_track_hearbeat_change_on_node_are_missing

Bug 5986/eventlogs to track hearbeat change on node are missing
Fixes #5837: Add event log for compliance mode and heart period

Conflicts:
	rudder-core/src/main/scala/com/normation/rudder/domain/eventlog/EventLogCategories.scala
	rudder-web/src/main/resources/eventLogTypeNames.properties