Suppress service identity warning
:0: UserWarning: You do not have a working installation of the service_identity module: 'No module named 'service_identity''. Please install it from https://pypi.python.org/pypi/service_identity:0: UserWarning: You do not have a working installation of the service_identity module: 'No module named 'service_identity''. Please install it from https://pypi.python.org/pypi/service_identity