**** CubicPower OpenStack Study ****
def append_v3_routers(mapper, routers):
trust_controller = controllers.TrustV3()
mapper.connect('/OS-TRUST/trusts',
controller=trust_controller,
action='create_trust',
conditions=dict(method=['POST']))
mapper.connect('/OS-TRUST/trusts',
controller=trust_controller,
action='list_trusts',
conditions=dict(method=['GET']))
mapper.connect('/OS-TRUST/trusts/{trust_id}',
controller=trust_controller,
action='delete_trust',
conditions=dict(method=['DELETE']))
mapper.connect('/OS-TRUST/trusts/{trust_id}',
controller=trust_controller,
action='get_trust',
conditions=dict(method=['GET']))
mapper.connect('/OS-TRUST/trusts/{trust_id}/roles',
controller=trust_controller,
action='list_roles_for_trust',
conditions=dict(method=['GET']))
mapper.connect('/OS-TRUST/trusts/{trust_id}/roles/{role_id}',
controller=trust_controller,
action='check_role_for_trust',
conditions=dict(method=['HEAD']))
mapper.connect('/OS-TRUST/trusts/{trust_id}/roles/{role_id}',
controller=trust_controller,
action='get_role_for_trust',
conditions=dict(method=['GET']))