Cython Rados module

Cython Rados module

Notable changes:

* run_in_thread have disapeared
* timeout argument of some methods are ignored
* rados_create_write_op/rados_create_read_op returns WriteOp/ReadOp
  instead of the pointer address
* rados_monitor_log callback 'arg' arguments was broken in previous python
  binding (callback was called with the pointer address instead pointed object)
* object attributes that was pointer addresses are now private and not accessible in python

Some tests have been added to cover all methods

Signed-off-by: Mehdi Abaakouk <sileht@redhat.com>