Simplify running cert tests and allow filtering, auto build

* Combine device and host into same scripts, switched on an argument
* Build automatically when you run
* Allow specifying a test filter, to run a specific test instead of all of them.
* Clean up file naming, to remove "facade only".

Test: gd/cert/run --host
Change-Id: I9d55c65f7fadc9b0a926aad03ad3a2ed8a5f0e63