internal/driver: skip tests requiring tcp on js (#373)

This commit upstreams the changes made in golang.org/cl/110096. As the
change says, it is acceptable for the new js/wasm target to only support
what nacl supports right now.

internal/driver/fetch_test.go

 }
 
 func TestHttpsInsecure(t *testing.T) {
-	if runtime.GOOS == "nacl" {
+	if runtime.GOOS == "nacl" || runtime.GOOS == "js" {
 		t.Skip("test assumes tcp available")
 	}
 	saveHome := os.Getenv(homeEnv())

internal/driver/webui_test.go

 )
 
 func TestWebInterface(t *testing.T) {
-	if runtime.GOOS == "nacl" {
+	if runtime.GOOS == "nacl" || runtime.GOOS == "js" {
 		t.Skip("test assumes tcp available")
 	}
 
 }
 
 func TestGetHostAndPort(t *testing.T) {
-	if runtime.GOOS == "nacl" {
+	if runtime.GOOS == "nacl" || runtime.GOOS == "js" {
 		t.Skip("test assumes tcp available")
 	}