Add t.Parallel() to java tests

Speeds up go test ./java from 32 seconds to 9 seconds.

Test: go test ./java
Change-Id: I4c6640e787c0744c6dfda03b7382839b452e24cf
diff --git a/java/genrule_test.go b/java/genrule_test.go
index 1c294b2..b4e9d21 100644
--- a/java/genrule_test.go
+++ b/java/genrule_test.go
@@ -31,6 +31,7 @@
 }
 
 func TestGenruleCmd(t *testing.T) {
+	t.Parallel()
 	fs := map[string][]byte{
 		"tool": nil,
 		"foo":  nil,
@@ -64,6 +65,7 @@
 }
 
 func TestJarGenrules(t *testing.T) {
+	t.Parallel()
 	ctx, _ := testJava(t, `
 		java_library {
 			name: "foo",