Use Client-ID in devstack ping request to Zaqar
Use Client-ID in devstack ping request to Zaqar

With the recently merged patch https://review.openstack.org/274972,
Zaqar now requires "Client-ID" header for API v2.

Our devstack plugin checks if Zaqar has started by sending request to
Zaqar's ping endpoint. But devstack plugin is not using "Client-ID"
header for sending this request, so the request now always fails and
devstack thinks that Zaqar service hasn't started.

This patch adds "Client-ID" header to the ping request to Zaqar in the
devstack plugin.

Change-Id: I441a5a9778d0676e0a380f5e20be40e1a029409f

openstack/zaqar,openstack/zaqar,openstack/zaqar,openstack/zaqar