autotest: minor adb_host modifications.

* Point autotest to use /data/autodir for the autodir of
  adb_host.
* Stub out verify_software and verify_job_repo_url for
  adb_host.
* Update moblab_host so that a MobLab can use the
  .android_tester file flag to specify if it is a
  MobLab under test or an adb_host.

BUG=None
TEST=local run.

Change-Id: Ice45ec65735ae78b1df8e21b49d9f52c546f465b
Reviewed-on: https://chromium-review.googlesource.com/299951
Commit-Ready: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
Reviewed-by: Kevin Cheng <kevcheng@google.com>
Reviewed-by: Dan Shi <dshi@chromium.org>
2 files changed