Initial commit of clients for nova, cinder, keystone and quantum.

* osclient/cinder/ ... a wrapper library for python-cinderclient
* osclient/keystone/ ... one for python-keystoneclient
* osclient/nova/ ... one for python-novaclient
* osclient/quantum/ ... yet another client library for quantum/neutron

* osclient/utils.py ... misc functions.
* osclient_shell ... a sample shell with osclient and IPython
* sample ... a sample script for keystone/quantum/nova
* sample_delete ... an utility to delete things 'sample' created