The default protocol used to create a security rule was changed to
``tcp``, which was a regression from the neutron client. Change it
back to ``any``, which skips sending the protocol to the API
server entirely when using the Neutron v2 API.
Users that had been creating rules without specifying a protocol
and expecting ``tcp`` need to change to use ``--protocol tcp``
explicitly.
Change-Id: Iedaa027240e00dced551513d8fa828564386b79f
Closes-bug: #1716789
33a255612c