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

android/soongconfig/modules_test.go

@@ -20,7 +20,6 @@ import (
 )
 
 func Test_CanonicalizeToProperty(t *testing.T) {
-	t.Parallel()
 	tests := []struct {
 		name string
 		arg  string
@@ -67,7 +66,6 @@ func Test_CanonicalizeToProperty(t *testing.T) {
 }
 
 func Test_typeForPropertyFromPropertyStruct(t *testing.T) {
-	t.Parallel()
 	tests := []struct {
 		name     string
 		ps       interface{}
@@ -188,7 +186,6 @@ func Test_typeForPropertyFromPropertyStruct(t *testing.T) {
 }
 
 func Test_createAffectablePropertiesType(t *testing.T) {
-	t.Parallel()
 	tests := []struct {
 		name                 string
 		affectableProperties []string