109 list vault

1. list all vaults (in the project_id).  
2. return dicts of vaultnames and their urls, structure is listed in tests/test_vault_controller.py

TODO: need return vault status heads.


We may need to consider have all return 409, which is also the failure code from Openstack Swift. Refer to:

http://docs.openstack.org/api/openstack-object-storage/1.0/content/delete-container.html