enable totp auth plugin

The only config change is in keystone.conf to enable totp auth plugin.

A secret can be generated via an arbitrary tool and uploaded to Keystone
via credential api by specifying "totp" credential type, secret and a
user id.

https://developer.openstack.org/api-ref/identity/v3/#create-credential

https://blueprints.launchpad.net/keystone/+spec/totp-auth
https://docs.openstack.org/keystone/pike/advanced-topics/auth-totp.html#configuring-totp

Change-Id: Ie3e4d828aae1f0918ace94adbdfdb81ffdc12878

templates/mitaka/keystone.conf

@@ -67,7 +67,7 @@ driver = {{ assignment_backend }}
 [oauth1]
 
 [auth]
-methods = external,password,token,oauth1
+methods = external,password,token,oauth1,totp
 password = keystone.auth.plugins.password.Password
 token = keystone.auth.plugins.token.Token
 oauth1 = keystone.auth.plugins.oauth1.OAuth

templates/ocata/keystone.conf

@@ -67,7 +67,7 @@ driver = {{ assignment_backend }}
 [oauth1]
 
 [auth]
-methods = external,password,token,oauth1,mapped,openid
+methods = external,password,token,oauth1,mapped,openid,totp
 password = keystone.auth.plugins.password.Password
 token = keystone.auth.plugins.token.Token
 oauth1 = keystone.auth.plugins.oauth1.OAuth