Allow CTS to find modules in subdir

In several advanced use cases, modules are not actually in
android-cts/testcases but linked from somewhere else.
Ensuring that we can find them when that's the case.

Test: unit tests
run cts-suite -m CtsGesture
> list modules
Bug: 70778109

Change-Id: I6db59d8c4050b72e72d632e4b9505220e9471b04
2 files changed