core: import glance image - update destinationImage status

Following change-id I37eba72dabb17c5ff4c9edaca899f206440791d0,
ImportRepoImageCopyTaskHandler -> endSuccessfully/endWithFailure:
ImageStatus should be updated according to 'destinationImageId'
(as it is saved in entity_snapshot for compensation).

Change-Id: I350de04cffba44ce1e394179305824d4ccaf544c
Bug-Url: https://bugzilla.redhat.com/1102785
Signed-off-by: Daniel Erez <derez@redhat.com>