Replace the deprecated nova_metadata_ip

As [1], the option nova_metadata_ip has been deprecated and
we can use nova_metadata_host instead. This patch makes devstack
do it.

[1]: http://git.openstack.org/cgit/openstack/neutron/tree/neutron/conf/agent/metadata/config.py#n49

Change-Id: Ifda43ec8c7743af6acdd3003c55c081ef5b1311c
1 file changed