core: enable to sort DC according to version.

enable to sort DC according to compatibility version in DC TAB.

Change-Id: I7a2ba8e21ca1cdf63f635d80a66e6d52ae48bba0
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1124378
Signed-off-by: Eli Mesika <emesika@redhat.com>