change http method for container right manage

This PR fix incompatible with ceph swift realisation, and align with official swift specs.

http://docs.openstack.org/api/openstack-object-storage/1.0/content/storage_container_services.html
http://docs.openstack.org/api/openstack-object-storage/1.0/content/POST_updateContainerMeta_v1__account___container__storage_container_services.html