There are two minor changes in this PR:
* Adjust quagga's jinja template to enable bgp-gr functionality by default. Currently is only applicable to those devices tagged as TOR/T0.
* Ensure that no bgp-notification is sent out to remote-peers during bgpd shutdown events. The goal here is to make sure that remote-peers kick off bgp-gr-helper logic (i.e. retain restarting-router state), which can be only achieved if an ungraceful-shutdown (tcp pipe/socket down) is perceived. There are other approaches to accomplish this goal, such as draft-ietf-idr-bgp-gr-notification, but this one hasn't been implemented yet by Quagga/FRR.
Signed-off-by: Rodny Molina <rmolina@linkedin.com>
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