Until the ceph upgrade is complete, a forked gnocchi repo will
be used for the stx-gnocchi image to allow temporary changes
to the gnocchi source to support the older ceph version.
Change-Id: I370086ca01e95e8b4907951328f29d833847b6b7
Story: 2004520
Task: 28912
Signed-off-by: Don Penney <don.penney@windriver.com>