In [1] we added support for FDB learning. In order to avoid issues
due to that table increasing without limits, which will impact OVN
performance, this patch is adding support for its aging mechanisms
which was added in OVN 23.09 in [2]. By default is disabled, so if
`localnet_learn_fdb` is enabled, the new configuration parameters
should be appropriately configured too: `fdb_age_threshold` and
`fdb_removal_limit`
[1] https://review.opendev.org/c/openstack/neutron/+/877675
[2] ae9a548882
Closes-Bug: 2035325
Change-Id: Ifdfaec35cc6b52040487a2b5ee08aba9282fc68b
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