pim6: T5733: add missing FRR PIM6 related features
(cherry picked from commit 403d2ffd6e46cb082b1d16ddf515e1784bee968c)
- Conflicts:
- data/templates/frr/pim6d.frr.j2
- interface-definitions/protocols-pim6.xml.in
- smoketest/scripts/cli/test_protocols_pim6.py
- src/conf_mode/protocols_pim6.py