BGP: Ensure default-originate works with update-groups

BGP: Ensure default-originate works with update-groups

Ticket: CM-7113
Reviewed By: CCR-3458
Testing Done: Manual testing, failed test, bgpsmoke (on 2.5-br)

This is a port of patch bgpd-update-groups-fix-default-originate.patch
from 2.5-br.

Even though default origination is configured for a BGP neighbor through
"neighbor default-originate" or "peer-group default-originate", the neighbor
may sometimes not receive the default route in some situations. Change to
ensure update subgroups also differentiate on default-originate sent status.

Signed-off-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by:   Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by:   Vipin Kumar <vipin@cumulusnetworks.com>