conntrack: T5217: Add tcp flag matching to system conntrack ignore
- Moves MSS node out of tcp-flags.xml.i and into tcp-mss.xml.i
- Update smoketest to verify TCP flag matching
(cherry picked from commit fb3ef9af5e394aa25692003fb3c185bfedefe3cb)
- Conflicts:
- interface-definitions/system-conntrack.xml.in
- python/vyos/template.py