Fix can't log into Horizon

I built monasca/devstack by using monasca-vagrant/ds-build.
Because monasca/devstack was old and made at July 2015.
Currently Keystone has admin_token disabled.
This patch switches using user/password instead of token.

See also: https://review.openstack.org/280467/

Change-Id: If5bc23ba09a1bffec5922f16e2bf109f345c374d

group_vars/all

@@ -8,7 +8,10 @@ monasca_api_url: http://{{ monasca_api_host }}:8070/v2.0
 monasca_agent_check_frequency: 15
 monasca_virtualenv_dir: /opt/monasca
 
-keystone_admin_token: ADMIN
+keystone_admin_token: ""
+keystone_admin: admin
+keystone_admin_password: admin
+keystone_admin_project: admin
 monasca_agent_user: monasca-agent
 monasca_agent_password: password
 monasca_agent_project: mini-mon

host_vars/mini-mon

@@ -37,9 +37,7 @@ vertica_users:
   - username: mon_persister
     password: password
     role: monasca_persister
-keystone_admin: admin
-keystone_admin_password: ""
-keystone_auth_method: token
+keystone_auth_method: password
 keystone_user: mini-mon
 keystone_password: password
 mysql_admin_password: password