Fix the endpoint type of zaqar notifier
Fix the endpoint type of zaqar notifier

Now since os-endpoint-type has been deprecated, so we need to use
'interface' to get the correct endpoint type of zaqar.

Change-Id: I9fb4d4836f1ef4e43359e9fddfe789a5e00d354c

openstack/aodh,openstack/aodh