Added parameters for availability zones configuration

For configuration availability zones for nova-compute
the corresponding options have been added.
For details see table Table 2.16 in
http://docs.openstack.org/juno/config-reference/content/list-of-compute-config-options.html

Change-Id: I284ebd9db3b5b7c5e9218621b516cf045e5d1375
Merge "Added parameters for availability zones configuration"