Split unit tests and interactive test apps apart

This CL splits the automated unit tests (*.tests package) and the
interactive test connection services (*.testapps package).

Apart from code hygiene and flexibility moving forward, this makes
Android manifest and build files, and the relevant dependencies,
simpler and easier to follow.

Change-Id: Id8c7763ae65f437fdfdabe8b0a4f3561adadbcb3