Move default Keystone API version to v3

This patch sets Keystone v3 as default in services
configuration files and in the openrc and stackrc scripts.

Change-Id: I24546f02067ea23d088d383b85e3a78d7b43f165
Partially-Implements: bp keystonev3
diff --git a/lib/heat b/lib/heat
index df44b76..3c3be79 100644
--- a/lib/heat
+++ b/lib/heat
@@ -167,7 +167,7 @@
     iniset $HEAT_CONF clients_keystone auth_uri $KEYSTONE_AUTH_URI
 
     # ec2authtoken
-    iniset $HEAT_CONF ec2authtoken auth_uri $KEYSTONE_SERVICE_URI/v2.0
+    iniset $HEAT_CONF ec2authtoken auth_uri $KEYSTONE_SERVICE_URI/v3
 
     # OpenStack API
     iniset $HEAT_CONF heat_api bind_port $HEAT_API_PORT