Fix gate devstack

A recent patch in devstack [1] forces the use of path access instead
of port for Keystone authentication, leading to connection error when
launching the devstack.

[1] https://review.openstack.org/#/c/456344/

Change-Id: I47b8035782bf27ee47227063381bc7dc041944b3

etc/barbican/barbican-functional.conf

@@ -2,7 +2,7 @@
 
 [identity]
 # Replace these with values that represent your identity configuration
-uri=http://localhost:5000/v3
+uri=http://localhost/identity/v3
 version=v3
 
 # Default user credentials

functionaltests/common/config.py

@@ -26,7 +26,7 @@ def setup_config(config_file=''):
 
     identity_group = cfg.OptGroup(name='identity')
     identity_options = [
-        cfg.StrOpt('uri', default='http://localhost:5000/v3'),
+        cfg.StrOpt('uri', default='http://localhost/identity/v3'),
         cfg.StrOpt('version', default='v3'),
         cfg.StrOpt('username', default='admin'),
         cfg.StrOpt('password', default='secretadmin', secret=True),