zebra: Allow GR to run per AFI as they are reported

The GR code in FRR used to wait till all AFI's were complete
before cleaning up the routes from the upper level protocol.
This of course can lead to some weird situations where say
ipv4 finishes and then v6 is stuck waiting for a peer to come
up and never finishes.  v4 when it finishes signals zebra that
it is done but no action is taken at that moment.

Modify the code to allow the zebra_gr.c code to handle a per
afi removal, instead of doing it all at the end.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>

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