Health probe for Nova pods is used for both liveness
and readiness probe.
nova-compute, nova-conductor, nova-consoleauth and nova-scheduler:
Check if the rpc socket status on the nova pods to rabbitmq and
database are in established state.
sends an RPC call with a non-existence method to component's queue.
Probe is success if agent returns with NoSuchMethod error.
If agent is not reachable or fails to respond in time,
returns failure to probe.
novnc/spice proxy: uses Kubernetes tcp probe on corresponding ports
they expose.
Added code to catch nova config file not present exception.
Change-Id: Ib8e4b93486588320fd2d562c3bc90b65844e52e5
49b58b7e7d