Merge pull request #1990 from priyawadhwa/revert-docker

 Remove docker plugin and revert to original code structure

cmd/skaffold/app/skaffold.go

@@ -20,17 +20,9 @@ import (
 	"io"
 
 	"github.com/GoogleContainerTools/skaffold/cmd/skaffold/app/cmd"
-	"github.com/GoogleContainerTools/skaffold/pkg/skaffold/build/plugin"
 )
 
 func Run(out, stderr io.Writer) error {
-	corePlugin, err := plugin.GetCorePluginFromEnv()
-	if err != nil {
-		return err
-	}
-	if corePlugin != "" {
-		return plugin.Execute(corePlugin)
-	}
 	c := cmd.NewSkaffoldCommand(out, stderr)
 	return c.Execute()
 }

integration/run_test.go

@@ -98,19 +98,6 @@ func TestRun(t *testing.T) {
 			// 	dir:         "examples/helm-deployment",
 			// 	deployments: []string{"skaffold-helm"},
 			// 	remoteOnly:  true,
-		}, {
-			description: "docker plugin in gcb exec environment",
-			dir:         "testdata/plugin/gcb",
-			deployments: []string{"leeroy-app", "leeroy-web"},
-			remoteOnly:  true,
-		}, {
-			description: "bazel plugin in local exec environment",
-			dir:         "testdata/plugin/local/bazel",
-			pods:        []string{"bazel"},
-		}, {
-			description: "docker plugin in local exec environment",
-			dir:         "testdata/plugin/local/docker",
-			deployments: []string{"leeroy-app", "leeroy-web"},
 		}, {
 			description: "jib in googlecloudbuild",
 			dir:         "testdata/jib",