et: ipv6: add NLM_F_APPEND in notifications when applicable

Age	Commit message (Expand)	Author	Files	Lines
David Ahern	1	-0/+3
	IPv6 does not set the NLM_F_APPEND flag in notifications to signal that a NEWROUTE is an append versus a new route or a replaced one. Add the flag if the request has it. Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>