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

makedeps/deps_test.go

@@ -23,6 +23,7 @@ import (
 )
 
 func TestParse(t *testing.T) {
+	t.Parallel()
 	testCases := []struct {
 		name   string
 		input  string
@@ -339,6 +340,7 @@ func BenchmarkParsing(b *testing.B) {
 }
 
 func TestDepPrint(t *testing.T) {
+	t.Parallel()
 	testCases := []struct {
 		name   string
 		input  Deps