Update TestHttpsInfoRogueCert for Go 1.7

The error message changed from

  remote error: bad certificate

To

  remote error: tls: bad certificate

In Go 1.7, so just checking for "bad certificate"
to make this test work on both Go 1.6 and 1.7

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

integration-cli/docker_cli_daemon_test.go

@@ -1474,7 +1474,7 @@ func (s *DockerDaemonSuite) TestTlsVerify(c *check.C) {
 // by using a rogue client certificate and checks that it fails with the expected error.
 func (s *DockerDaemonSuite) TestHttpsInfoRogueCert(c *check.C) {
 	const (
-		errBadCertificate   = "remote error: bad certificate"
+		errBadCertificate   = "bad certificate"
 		testDaemonHTTPSAddr = "tcp://localhost:4271"
 	)