Fixes #3468: show only distinct rules depending of a directive
Merge pull request #168 from fanf/bug_3468/multiple_rule_in_dependency_popup_when_disabling_directive

Fixes #3468: show only distinct rules depending of a directive
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5

Conflicts:
	rudder-web/src/main/scala/com/normation/rudder/web/components/DirectiveEditForm.scala
	rudder-web/src/main/scala/com/normation/rudder/web/components/NodeGroupForm.scala