Support/Remove additional calls for for Tenant.

[Yogeshwar]

These are the pending calls that need to be implemented.
GET v2.0/tenants/{tenantId}/users?roleId=string&marker=string&limit=int Lists all the users for a tenant.

These calls could be removed from the OSKSADM WADL as they don't add lot of value.
GET v2.0/users/{userId}/roles/OSKSADM/{roleId} Get information about a global role that belongs to a user.
GET v2.0/tenants/{tenantId}/OS-KSADM/roles?marker=string&limit=int Lists all the roles for a tenant.

[Openstack Gerrit (openstack-gerrit)]

Reviewed: https://review.openstack.org/1281
Committed: http://github.com/openstack/keystone/commit/c312c25ab486313f024a3a517d6082d4a3d98341
Submitter: Jenkins
Branch: master

 status fixcommitted
 done

commit c312c25ab486313f024a3a517d6082d4a3d98341
Author: Yogeshwar Srikrishnan <email address hidden>
Date: Tue Nov 1 17:15:22 2011 -0500

    Bug #884930 Support/Remove additional calls for for Tenant.
    - Supported call to get users for a tenant for a specific role.
    - Removed calls to get specific role for a user and to get
    all the roles for a specific tenant as they are not useful.
    - Fixed LDAP backend call to get users for a tenant.
    - Disabling Invalid pylint check.

    Change-Id: I8c9dbc206d06a55e5c5ddc1163680103563eacc4