core: Remove remains of version 2.2 from FencingPolicyHelper

Removes unnecessary condtions from FencingPolicyHelper class which was
needed when 2.2 was containt in Version.ALL list.

Change-Id: Iba815fc8a35969917360fea1eccc646e679426b8
Bug-Url: https://bugzilla.redhat.com/1127590
Signed-off-by: Martin Perina <mperina@redhat.com>