[TEMP?] Revert "Extensive and thoughtful modifications to vendor_module_check"

I'm chasing a ghost w/ shamu, and figure it might be proprietary-wonk, so bringing this back in the hopes it might reveal something

This reverts commit a0722d78811a6110e0f3e7bd8ac81bfa3f997fce.

Change-Id: Ic21d76ef4938c0a402801d0d35649a68c70b6efd
envsetup: new function cmka

- The build system adds a clean-<module> target
  for each module / package.
- This utilizes that and cleans and builds using mka.
- If no argument is supplied, it runs "mka clean".
- If argument is (bacon|otapackage|systemimage), it
  runs installclean.

Change-Id: I582ac2f92df3278c41c254c73e9c02ad7f406851
(cherry picked from commit eb74c2f2b9bb708e77edfdbb8ba0d0b716fef2fc)
(Also sneak in another minor change, a help entry for mkap)
releasetools: clean up residual targetfiles-* dirs in /tmp/

Change-Id: I3792307663f8a85513e102c8bf3d78cf4e514760