session: accept notifies for sessions in created state
session: accept notifies for sessions in created state

Makes sure we don't notify apps of sessions that are closing or multiple
times for the same session.

Type: improvement

Signed-off-by: Florin Coras <c9715e5cdf0718c2e9b10678757dfb027875eba2@cisco.com>
Change-Id: I07145e5e00bbe8eb1df2946059459e9fe05cfeb7

FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp