Run os-net-config before restarting cluster on update
Run os-net-config before restarting cluster on update

Running os-net-config before restarting the cluster prevents changes to
the interface files caused by changes to implementation from bouncing
network interfaces after the cluster has restarted.

Closes-Bug: #1644138

Change-Id: I65fb104465ff3d37ddc791634302994334136014
(cherry picked from commit 476b05442817263d90e8c54a9b79cd0a8625862c )

trozet/opnfv-tht,trozet/opnfv-tht,trozet/opnfv-tht