Add Support for Nova API Bind Address

Previously, Nova would always bind to '0.0.0.0'.

This change allows users to specify the IP address for
binding Nova API endpoints.

The change introduces the api_bind_address parameter within the
openstack::nova::controller class and the nova_bind_address in
the openstack::controller class.  nova_bind_address was used for
consistency with other OpenStack services.

Defaults to '0.0.0.0' for backwards compatibility and to have all
Nova API's bind to all IP addresses.

Change-Id: I467e9259f8dea75a265e1cc063bea7305f918307
Merge "Add Support for Nova API Bind Address"