core: glance import as template should fail on old DCs

If the DC compatibility level is less than 3.4 then the glance import should fail on canDoAction.
This patch adds this validation

Change-Id: I4b975d2f8d540af6f0a3c8e4de9296173950f9ce
Bug-Url: https://bugzilla.redhat.com/1072023
Signed-off-by: Oved Ourfali <oourfali@redhat.com>