Clean up linux bionic and zipapex test support.

They were only needed for the host APEX, which has been removed.

Test: art/tools/buildbot-build.sh --host
      art/test/testrunner/testrunner.py --host --64
Bug: 279835185
Change-Id: I86bee85ce3d5eeba2a031cedc2d1ea5768a77f2d
5 files changed