Remove integration-cli TestDaemonSuite/TestDaemonIPv6Enabled

The test hadn't been running, because it used testRequires(c, IPv6)
and predicate "IPv6" returns the opposite of the expected result.

TestDaemonIPv6Enabled tried to run with IPv6 on the default bridge,
but didn't set up a "fixed-cidr-v6" - so the daemon wouldn't start.

It then tried to check the bridge had address "fe80::1", which it
expected to work because it had just used setupV6() to add that
address.

Then it  checked that "LinkLocalIPv6Address" was set in container
inspect output, but it wouldn't be (the field is deprecated).

There are working IPv6 tests in the suite (TestDaemonIPv6FixedCIDR,
TestDaemonIPv6FixedCIDRAndMac, TestDaemonIPv6HostMode) - and there's
more coverage in the network integration tests.

So, deleted the test as it didn't seem worth salvaging.

Also deleted now-unused helper functions setupV6(), teardownV6().

Signed-off-by: Rob Murray <rob.murray@docker.com>

integration-cli/docker_cli_daemon_test.go

@@ -282,65 +282,6 @@ func verifyIPTablesDoesNotContains(c *testing.T, ipTablesSearchString string) {
 	}
 }
 
-// TestDaemonIPv6Enabled checks that when the daemon is started with --ipv6=true that the docker0 bridge
-// has the fe80::1 address and that a container is assigned a link-local address
-func (s *DockerDaemonSuite) TestDaemonIPv6Enabled(c *testing.T) {
-	testRequires(c, IPv6)
-
-	setupV6(c)
-	defer teardownV6(c)
-
-	s.d.StartWithBusybox(testutil.GetContext(c), c, "--ipv6")
-
-	iface, err := net.InterfaceByName("docker0")
-	if err != nil {
-		c.Fatalf("Error getting docker0 interface: %v", err)
-	}
-
-	addrs, err := iface.Addrs()
-	if err != nil {
-		c.Fatalf("Error getting addresses for docker0 interface: %v", err)
-	}
-
-	var found bool
-	expected := "fe80::1/64"
-
-	for i := range addrs {
-		if addrs[i].String() == expected {
-			found = true
-			break
-		}
-	}
-
-	if !found {
-		c.Fatalf("Bridge does not have an IPv6 Address")
-	}
-
-	if out, err := s.d.Cmd("run", "-itd", "--name=ipv6test", "busybox:latest"); err != nil {
-		c.Fatalf("Could not run container: %s, %v", out, err)
-	}
-
-	out, err := s.d.Cmd("inspect", "--format", "'{{.NetworkSettings.Networks.bridge.LinkLocalIPv6Address}}'", "ipv6test")
-	if err != nil {
-		c.Fatalf("Error inspecting container: %s, %v", out, err)
-	}
-	out = strings.Trim(out, " \r\n'")
-
-	if ip := net.ParseIP(out); ip == nil {
-		c.Fatalf("Container should have a link-local IPv6 address")
-	}
-
-	out, err = s.d.Cmd("inspect", "--format", "'{{.NetworkSettings.Networks.bridge.GlobalIPv6Address}}'", "ipv6test")
-	if err != nil {
-		c.Fatalf("Error inspecting container: %s, %v", out, err)
-	}
-	out = strings.Trim(out, " \r\n'")
-
-	if ip := net.ParseIP(out); ip != nil {
-		c.Fatalf("Container should not have a global IPv6 address: %v", out)
-	}
-}
-
 // TestDaemonIPv6FixedCIDR checks that when the daemon is started with --ipv6=true and a fixed CIDR
 // that running containers are given a link-local and global IPv6 address
 func (s *DockerDaemonSuite) TestDaemonIPv6FixedCIDR(c *testing.T) {
@@ -1442,17 +1383,6 @@ func (s *DockerDaemonSuite) TestDaemonTLSVerifyIssue13964(c *testing.T) {
 	})
 }
 
-func setupV6(c *testing.T) {
-	// Hack to get the right IPv6 address on docker0, which has already been created
-	result := icmd.RunCommand("ip", "addr", "add", "fe80::1/64", "dev", "docker0")
-	result.Assert(c, icmd.Success)
-}
-
-func teardownV6(c *testing.T) {
-	result := icmd.RunCommand("ip", "addr", "del", "fe80::1/64", "dev", "docker0")
-	result.Assert(c, icmd.Success)
-}
-
 func (s *DockerDaemonSuite) TestDaemonRestartWithContainerWithRestartPolicyAlways(c *testing.T) {
 	s.d.StartWithBusybox(testutil.GetContext(c), c)