Updates to management of services

[mamullen13316]

• The create_service() method was updated to take a list of dicts containing port and protocol. This is because a single service can contain multiple port/protocols.

Example:

fw.create_service(name="FUNC_TESTSVC1", service_list=[{"dst_port": "1234", "protocol": "TCP"}, {"dst_port": "2222", "protocol": "TCP}])

• The create_service() method was also updated to optionally support specification of source port(s). The default is 1:65535.
• An update_service() method was created to allow adding or removing port/protocol pairs from the list, or they can be replaced.

fw.update_service(name="TEST_SVC", action="add", service_list=[{"dst_port": "2222", "protocol": "TCP"}])

• Updated create_service() tests