Display node AZ in `nodepool list` output
Display node AZ in `nodepool list` output

Add the availability zone data for a node to the `nodepool list` output.
This should aid in debugging of AZs.

Change-Id: If861e666c5d9eec4f4f1ddf1bb431fb06436b6e6

seandst/nodepool,Tesora/tesora-nodepool,Tesora/tesora-nodepool,citrix-openstack/nodepool,seandst/nodepool,citrix-openstack/nodepool