neigh: Add IPv6 neighbor discovery runtime test
neigh: Add IPv6 neighbor discovery runtime test

Full test suite code to check on IPv6 next hops and direct neighbors. This
is analog to our IPv4 based ARP test suite.

  root@foo:~/go/src/github.com/cilium/cilium/pkg/datapath/linux# go test --tags=privileged_tests -v -check.vv -check.f TestArp
  === RUN   Test
  START: node_linux_test.go:971: linuxPrivilegedIPv6OnlyTestSuite.TestArpPingHandling
  START: node_linux_test.go:107: linuxPrivilegedIPv6OnlyTestSuite.SetUpTest
  PASS: node_linux_test.go:107: linuxPrivilegedIPv6OnlyTestSuite.SetUpTest	0.221s

  level=info msg="Successfully removed non-GC'ed ARP entries previously installed by cilium-agent" count=1 subsys=linux-datapath
  START: node_linux_test.go:129: linuxPrivilegedIPv6OnlyTestSuite.TearDownTest
  PASS: node_linux_test.go:129: linuxPrivilegedIPv6OnlyTestSuite.TearDownTest	0.116s

  PASS: node_linux_test.go:971: linuxPrivilegedIPv6OnlyTestSuite.TestArpPingHandling	120.869s

  START: node_linux_test.go:1505: linuxPrivilegedIPv4OnlyTestSuite.TestArpPingHandling
  START: node_linux_test.go:112: linuxPrivilegedIPv4OnlyTestSuite.SetUpTest
  PASS: node_linux_test.go:112: linuxPrivilegedIPv4OnlyTestSuite.SetUpTest	0.001s

  level=info msg="Successfully removed non-GC'ed ARP entries previously installed by cilium-agent" count=1 subsys=linux-datapath
  START: node_linux_test.go:133: linuxPrivilegedIPv4OnlyTestSuite.TearDownTest
  PASS: node_linux_test.go:133: linuxPrivilegedIPv4OnlyTestSuite.TearDownTest	0.104s

  PASS: node_linux_test.go:1505: linuxPrivilegedIPv4OnlyTestSuite.TestArpPingHandling	98.671s

  OK: 2 passed
  --- PASS: Test (219.98s)
  PASS
  ok  	github.com/cilium/cilium/pkg/datapath/linux	219.993s
  root@foo:~/go/src/github.com/cilium/cilium/pkg/datapath/linux#

Signed-off-by: Daniel Borkmann <3d0f3b9ddcacec30c4008c5e030e6c13a478cb4f@iogearbox.net>

cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium