bgpd : no neighbor <> send-community large is not working dynamically

bgpd : no neighbor <> send-community large is not working dynamically

updgrp_hash_key_make() uses the PEER_UPDGRP_AF_FLAGS for the key.
PEER_UPDGRP_AF_FLAGS contains the neigbor flags.
If user do no neighbor <> send community large, then the hash key
does not change and BGP does not send update for large community change.
Added the PEER_FLAG_SEND_LARGE_COMMUNITY in PEER_UPDGRP_AF_FLAGS.
After this the hash key gets changed and update will be processed
with large community.

Signed-off-by: vishaldhingra<vdhingra@vmware.com>