core: RecoveryStoragePool - update domain format

After completing successfully the execution of reconstruct to the given
pool using the given domain, the domain version should be updated if
necessary.

Note: the performed operation is aligned with the one perform in attach
storage domain command.

Change-Id: I99db93aee407d78141714416836f5778d1b141f2
Bug-Url: https://bugzilla.redhat.com/947805
Signed-off-by: Liron Aravot <laravot@redhat.com>