fix `helm get manifest` context deadline exceeded error

(cherry picked from commit 87c64e7987)

cmd/helm/get_manifest.go

@@ -55,9 +55,7 @@ func newGetManifestCmd(client helm.Interface, out io.Writer) *cobra.Command {
 				return errReleaseRequired
 			}
 			get.release = args[0]
-			if get.client == nil {
+			get.client = ensureHelmClient(get.client)
-				get.client = helm.NewClient(helm.Host(settings.TillerHost))
-			}
 			return get.run()
 		},
 	}