core: Remove version 2.2 from Version and VersionStorageFormatUtil

Remove last usage of version 2.2 from VersionStorageFormatUtil and
Version classes.

Change-Id: Id43f292215cf35c1e2834c2a2fdac6b08a3bdb2b
Bug-Url: https://bugzilla.redhat.com/1127590
Signed-off-by: Martin Perina <mperina@redhat.com>