Tests for "feature" split APKs.

Adds a new "feature" split APK which contains code, new manifest
components, and its own set of split resources.  Verify that code
and resources from both base and feature coexist, and that they can
interact with each other.

Bug: 16947729
Change-Id: I8cc1a6c3402ce994aacd9c103338393fb3d145f2
17 files changed