Add more credentials information to check_is_admin
Add more credentials information to check_is_admin

Currently, It can specify only user_id when checking admin.
Add more information for checking admin because it is not enough
in multi-domain configuration.

Change-Id: I31913b393cb0f763d00e71e27aa96551bf04ce5d
closes-bug:1688021

openstack/smaug,openstack/smaug