Fix pyghmi path
Fix pyghmi path

Pyghmi was moved from openstack namespace to the x
namespace. As such the devstack plugin needs to match
up otherwise devstack fails in CI to clone as cloning
is blocked if not in the projects list... Which it is,
as x/pyghmi.

Change-Id: I87bdf65dd2dac189642d0af6def2d0ed155f3c00

openstack/ironic,openstack/ironic