tempest: several fixes to tempest config

* tempest_roles: removed, as this is only used when the test
requires additional roles to be assigned.
Currently no test needs extra roles so adding those is changing
the expected output of some of the tests.

 * domain_specific_drivers: set to True. This needs to be a mirror
of the same value on the keystone chart

Change-Id: I1c84ed1ed5b1c2d8abd9e089044f40d08838c422

tempest/values.yaml

@@ -135,7 +135,6 @@ conf:
       # admin_domain_name value set by configmap-etc
       admin_domain_name: null
       use_dynamic_credentials: true
-      tempest_roles: admin, member
     identity:
       admin_domain_scope: false
       auth_version: v3
@@ -145,6 +144,8 @@ conf:
       uri_v3: null
     identity-feature-enabled:
       api_v3: true
+      # this value should be the same as the keystone chart conf.keystone.identity.domain_specific_drivers_enabled
+      domain_specific_drivers: true
     image:
       http_image: "http://download.cirros-cloud.net/0.3.5/cirros-0.3.5-x86_64-disk.img"
       container_formats: bare