fuel-plugin-ovs: Fix missing git change

fuel-plugin-ovs: Fix missing git change

Upstream Fuel@OPNFV recently set the git change for upstream
fuel-plugin-ovs git repo, aside from setting branch to stable/9.0.

This led to Armband patches being silently ignored and building
an "amd64"-only version of the OVS plugin in Armband.

NOTE: Since Armband uses git submodules to track the patches plugins,
including fuel-plugin-ovs, we automatically fetch latest branch HEAD
from upstream plugins (by using `git submodules update --remote`), so
the Fuel recent pinning is bypassed anyway.

JIRA: ARMBAND-166

Change-Id: Ide96f16f9b2577fc184c759dd153298df0be24c6
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>