Merge pull request #17499 from jfrazelle/fix-lxc-tests

lxc does not support exec

integration-cli/docker_cli_network_unix_test.go

@@ -441,6 +441,7 @@ func (s *DockerNetworkSuite) TestDockerNetworkDriverOptions(c *check.C) {
 }
 
 func (s *DockerDaemonSuite) TestDockerNetworkNoDiscoveryDefaultBridgeNetwork(c *check.C) {
+	testRequires(c, ExecSupport)
 	// On default bridge network built-in service discovery should not happen
 	hostsFile := "/etc/hosts"
 	bridgeName := "external-bridge"
@@ -518,6 +519,7 @@ func (s *DockerDaemonSuite) TestDockerNetworkNoDiscoveryDefaultBridgeNetwork(c *
 }
 
 func (s *DockerNetworkSuite) TestDockerNetworkAnonymousEndpoint(c *check.C) {
+	testRequires(c, ExecSupport)
 	hostsFile := "/etc/hosts"
 	cstmBridgeNw := "custom-bridge-nw"