Add tests for converting license in androidmk

1. Added unit tests for license conversions in the androidmk tool, by
using a mocked filesystem;
2. Added integration tests in a shell script with a mocked filesystem.

Bug: 205615944
Test: m androidmk
Test: bash androidmk_test.sh
Test: TreeHugger
Change-Id: Id3d1f914190b52b82aadda7ea019192787b839d6
diff --git a/bpfix/Android.bp b/bpfix/Android.bp
index 345dbd0..a72d9b4 100644
--- a/bpfix/Android.bp
+++ b/bpfix/Android.bp
@@ -52,5 +52,6 @@
     ],
     deps: [
         "blueprint-parser",
+        "blueprint-pathtools",
     ],
 }