Neutron API accepts also protocol numbers as protocols for security
groups. This patch makes support for it in OVS firewall driver. iptables
driver already supports it.
Fullstack test covering SCTP connection was added and it requires
ip_conntrack_proto_sctp kernel module in order to make conntrack work
with SCTP.
Change-Id: I6c5665a994c4a50ddbb95cd1360be0de0a6c7e40
Closes-bug: 1625516