Add glide.yaml and vendor deps

vendor/github.com/docker/engine-api/client/plugin_push.go

@@ -0,0 +1,15 @@
+// +build experimental
+
+package client
+
+import (
+	"golang.org/x/net/context"
+)
+
+// PluginPush pushes a plugin to a registry
+func (cli *Client) PluginPush(ctx context.Context, name string, registryAuth string) error {
+	headers := map[string][]string{"X-Registry-Auth": {registryAuth}}
+	resp, err := cli.post(ctx, "/plugins/"+name+"/push", nil, nil, headers)
+	ensureReaderClosed(resp)
+	return err
+}