@abc.abstractmethod
    def add_port(self, bridge, port, may_exist=True):
Creates a short_sigstring that does not include package names for
dataset/ETHPy150Open openstack/neutron/neutron/agent/ovsdb/api.py/API.add_port--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/core/vistrail/port_spec.py/PortSpec.create_tooltip