Make lots of tests run in parallel

Putting t.Parallel() in each test makes them run in parallel.
Additional t.Parallel() could be added to each subtest, although
that requires making a local copy of the loop variable for
table driven tests.

Test: m checkbuild
Change-Id: I5d9869ead441093f4d7c5757f2447385333a95a4

android/csuite_config_test.go

@@ -32,6 +32,7 @@ func testCSuiteConfig(test *testing.T, bpFileContents string) *TestContext {
 }
 
 func TestCSuiteConfig(t *testing.T) {
+	t.Parallel()
 	ctx := testCSuiteConfig(t, `
 csuite_config { name: "plain"}
 csuite_config { name: "with_manifest", test_config: "manifest.xml" }