Return status for compute node

Currently when return compute node information, there is no status returned.

When the corresponding service is disabled or down and users try to
do 'hypervisor-list' or 'hypervisor-show', they will have no idea of it.

Implements: blueprint return-status-for-hypervisor-node
Closes-Bug: #1285259

DocImpact

Change-Id: I17c53b454ccef023f298f1b8875daef965d2325d
Merge "Return status for compute node"