Revert "Make lots of tests run in parallel"

This reverts commit 323dc60712.

Reason for revert: Possible cause of test instability
Bug: 170513220
Test: soong tests

Change-Id: Iee168e9fbb4210569e6cffcc23e60d111403abb8

remoteexec/remoteexec_test.go

@@ -22,7 +22,6 @@ import (
 )
 
 func TestTemplate(t *testing.T) {
-	t.Parallel()
 	tests := []struct {
 		name   string
 		params *REParams
@@ -68,7 +67,6 @@ func TestTemplate(t *testing.T) {
 }
 
 func TestNoVarTemplate(t *testing.T) {
-	t.Parallel()
 	params := &REParams{
 		Labels:      map[string]string{"type": "compile", "lang": "cpp", "compiler": "clang"},
 		Inputs:      []string{"$in"},
@@ -85,7 +83,6 @@ func TestNoVarTemplate(t *testing.T) {
 }
 
 func TestTemplateDeterminism(t *testing.T) {
-	t.Parallel()
 	r := &REParams{
 		Labels:      map[string]string{"type": "compile", "lang": "cpp", "compiler": "clang"},
 		Inputs:      []string{"$in"},