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 #143559
dind allowed to fail
docker_centos-6-amd64

00:01:24

passed #143560
dind allowed to fail
docker_centos-7-amd64

00:01:31

passed #143549
dind allowed to fail
docker_debian-7-amd64

00:01:37

passed #143553
dind allowed to fail
docker_debian-7-i386

00:01:40

passed #143550
dind allowed to fail
docker_debian-8-amd64

00:03:50

passed #143554
dind allowed to fail
docker_debian-8-i386

00:02:47

passed #143551
dind allowed to fail
docker_debian-9-amd64

00:02:31

passed #143555
dind allowed to fail
docker_debian-9-i386

00:02:00

passed #143552
dind allowed to fail
docker_debian-testing-amd64

00:02:30

passed #143556
dind allowed to fail
docker_debian-testing-i386

00:01:57

passed #143557
dind allowed to fail
docker_fedora-25-amd64

00:03:31

passed #143558
dind allowed to fail
docker_fedora-26-amd64

00:04:28

passed #143561
dind allowed to fail
docker_opensuse-42_3-amd64

00:03:43

passed #143562
dind allowed to fail
docker_ubuntu-14_04-amd64

00:02:56

passed #143563
dind allowed to fail
docker_ubuntu-16_04-amd64

00:02:08

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

00:02:10

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

00:02:19

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

00:01:27

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

00:01:34

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

00:01:29

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

00:01:41

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

00:02:10

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

00:02:06

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

00:01:26

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

00:02:03

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

00:02:12

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

00:02:20

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

00:02:57

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

00:03:02

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

00:02:24

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

00:01:03

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

00:01:18