Implement vts_config module

Test: internal (see android/vts_config_test.go) + run 'm vts' and check
that host/linux-x86/vts/android-vts.zip remians the same
Change-Id: I0249a974a240e7669c3b9378c17739df8e120873
Fixes: 122617100
diff --git a/Android.bp b/Android.bp
index 36a428a..ee51942 100644
--- a/Android.bp
+++ b/Android.bp
@@ -67,6 +67,7 @@
         "android/testing.go",
         "android/util.go",
         "android/variable.go",
+        "android/vts_config.go",
         "android/writedocs.go",
 
         // Lock down environment access last
@@ -85,6 +86,7 @@
         "android/rule_builder_test.go",
         "android/util_test.go",
         "android/variable_test.go",
+        "android/vts_config_test.go",
     ],
 }