Service initialization should be easier

[ahggns]

I've been copying around this kind of function to make service initialization easier, either the process to initialize a service should be easier or a function like this should be exposed by conjure-python-client.

def create_service(uris, service):
    # type: (List[str], Type[T]) -> T
    config = httpremoting.ServiceConfiguration()
    config.uris = uris
    agent = '{}_conjure_client'.format(service.__name__)
    return httpremoting.RequestsClient.create(service, agent, config)