Fixes #5767: add extension point for plugins in node details
Merge pull request #659 from fanf/bug_5767/missing_node_details_plugin_extension_point

Fixes #5767: add extension point for plugins in node details
Merge branch 'branches/rudder/2.6' into branches/rudder/2.10

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