Add new cli method

Add new method for calling openstack clis
Add new method for getting uuid via cli
These methods are based upon the identity register provider ones
Add tests
Related change in network: I89dd47c802a544bdd998059b36884cb10f628223

Change-Id: I2b2f1d94dbd67550ad3a352c2205a532173f6065
Implements: blueprint neutron-icehouse-default-changes