BGP: Handle missing NEXT_HOP attribute properly

RFC 7606 specifies handle-as-withdraw instead of session reset.
32 jobs for int-new in 11 minutes and 30 seconds (queued for 12 seconds)
Status Job ID Name Coverage
  Image
passed docker_centos-6-amd64 #143559
dind

00:01:24

passed docker_centos-7-amd64 #143560
dind

00:01:31

passed docker_debian-7-amd64 #143549
dind

00:01:37

passed docker_debian-7-i386 #143553
dind

00:01:40

passed docker_debian-8-amd64 #143550
dind

00:03:50

passed docker_debian-8-i386 #143554
dind

00:02:47

passed docker_debian-9-amd64 #143551
dind

00:02:31

passed docker_debian-9-i386 #143555
dind

00:02:00

passed docker_debian-testing-amd64 #143552
dind

00:02:30

passed docker_debian-testing-i386 #143556
dind

00:01:57

passed docker_fedora-25-amd64 #143557
dind

00:03:31

passed docker_fedora-26-amd64 #143558
dind

00:04:28

passed docker_opensuse-42_3-amd64 #143561
dind

00:03:43

passed docker_ubuntu-14_04-amd64 #143562
dind

00:02:56

passed docker_ubuntu-16_04-amd64 #143563
dind

00:02:08

 
  Build
passed build-centos-6-amd64 #143570
docker linux amd64

00:02:10

passed build-centos-7-amd64 #143571
docker linux amd64

00:02:19

passed build-debian-7-amd64 #143564
docker linux amd64

00:01:27

passed build-debian-7-i386 #143575
docker linux amd64

00:01:34

passed build-debian-8-amd64 #143565
docker linux amd64

00:01:29

passed build-debian-8-i386 #143576
docker linux amd64

00:01:41

passed build-debian-9-amd64 #143566
docker linux amd64

00:02:10

passed build-debian-9-i386 #143577
docker linux amd64

00:02:06

passed build-debian-testing-amd64 #143567
docker linux amd64

00:01:26

passed build-debian-testing-i386 #143578
docker linux amd64

00:02:03

passed build-fedora-25-amd64 #143568
docker linux amd64

00:02:12

passed build-fedora-26-amd64 #143569
docker linux amd64

00:02:20

passed build-freebsd-11-amd64 #143579
freebsd amd64

00:02:57

passed build-freebsd-11-i386 #143580
freebsd i386

00:03:02

passed build-opensuse-42_3-amd64 #143572
docker linux amd64

00:02:24

passed build-ubuntu-14_04-amd64 #143573
docker linux amd64

00:01:03

passed build-ubuntu-16_04-amd64 #143574
docker linux amd64

00:01:18