ifcfg: don't restart ovs if --no-activate is specified
ifcfg: don't restart ovs if --no-activate is specified

When --no-activate is specified, there is a chance that
openvswitch service will still be restarted if dpdk port
configuration file is changed. This adds a condition to
check activate and restart openvswitch only if activate
is true.

Change-Id: Ia5a6d04eb26cc3a6e10caacb8256d6e2d183239e
Closes-Bug: #1751955

openstack/os-net-config