Added parameters for availability zones configuration

For configuration availability zones for nova-compute
the corresponding options have been added.

Upstream patch id: I284ebd9db3b5b7c5e9218621b516cf045e5d1375
Implements: blueprint availability-zones

Change-Id: I67d045e751c8d39df6237bcaeb315f7af12a1894
Merge "Added parameters for availability zones configuration"