Add special case upgrade from openvswitch 2.5.0-14

Add special case upgrade from openvswitch 2.5.0-14

In [1] we removed the previously used special case upgrade code.
However we have since discovered that for openvswitch 2.5.0-14
the special case is still required with an extra flag to prevent
the restart.  This adds the upgrade code back into the minor
update and 'manual upgrade' scripts for compute/swift. The
review at If998704b3c4199bbae8a1d068c31a71763f5c8a2 is adding
this logic for the ansible upgrade steps.

Related-Bug: 1669714
[1] https://review.openstack.org/#/q/59e5f9597eb37f69045e470eb457b878728477d7
Change-Id: I3e5899e2d831b89745b2f37e61ff69dbf83ff595