qt: expose functions in OF0x01.FlowMod.Command

to_int and of_info for marshal and parse, respectively.
qt: add roundtrip test for OF0x01.FlowMod.Command
qt: expose functions in OF0x01.FlowMod.Timeout

to_int and of_info for marshal and parse, respectively.
qt: add roudtrip test for OF0x01.FlowMod.Timeout
qt: use PseudoPort.arbitrary_nc to ignore controller

Certain functions on in the OpenFlow0x01 API expect a pseudoPort but
do not handle the Controller variant properly. At some point the code
should discriminate on the different input domains at the type level,
but until then use this function to test.

With this commit the Enqueue case of the Action roundtrip test now
works, which was introduced but commented out in fa51a3f29.

Related to #5.
qt: expose functions in OF0x01.FlowMod

These are all the functions that are necessary to creat an
OpenFlow0x01_ArbitraryCstruct module.
qt: fix bug in FlowMod out_port parsing

The out_port was always assumed to be either absent or to be
representing a physical port. The PseudoPort.make functions was simply
not being called.
qt: add roundtrip testing for 0x01.FlowMod