RFC4861 allows us to specify the Link MTU using IPv6 RAs.
When advertise_mtu is set in the config, this patch supports
advertising the LinkMTU using Router Advertisements.
Conflicts:
neutron/agent/linux/ra.py
neutron/common/config.py
neutron/db/l3_db.py
neutron/tests/common/l3_test_common.py
neutron/tests/unit/agent/l3/test_agent.py
neutron/tests/unit/db/test_l3_db.py
Liberty modifications:
- In test_l3_db.py, added two test cases that were covering the
change in Mitaka+.
Partially Implements: blueprint mtu-selection-and-advertisement
Closes-Bug: #1495444
Change-Id: I50d40cd3b8eabf1899461a80e729d5bd1e727f28
(cherry picked from commit 47713f5870)
0991b190df