Ensure endpoint type is used for network commands

Currently OS_ENDPOINT_TYPE and --os-interface are being ignored for
network commands. This means the public URL is always used.

Make sure that these are picked up correctly so we hit the correct
endpoint (internal/admin/etc.) for commands such as:

 $ openstack --os-interface internal network list

Change-Id: Iac05204e3056e386d84d3644b5da1a2bb322bb0a
Closes-bug: 1592368

openstackclient/network/client.py

@@ -36,6 +36,7 @@ def make_client(instance):
     prof = profile.Profile()
     prof.set_region(API_NAME, instance._region_name)
     prof.set_version(API_NAME, instance._api_version[API_NAME])
+    prof.set_interface(API_NAME, instance._interface)
     conn = connection.Connection(authenticator=instance.session.auth,
                                  verify=instance.session.verify,
                                  cert=instance.session.cert,