[autotest] Minor cleanup of adb_host.

Mostly a comment cleanup of s/host/test station/ with some side code
fixes.

- Added verify_connectivity and list_files_glob so repair works on
ADBHost.
- Added get_tmp_dir to LocalHost
- Fixed ADBHost get_tmp_dir to create the tmp dir on the device (instead
  of the teststation).

BUG=chromium:548739
TEST=Locally ran dummy test on a moblab/(beaglebone,dragon) and
moblab/angler.

Change-Id: I618ba1debbf1523b73ba48f507b1769ef3d0fa8d
Reviewed-on: https://chromium-review.googlesource.com/312508
Commit-Ready: Kevin Cheng <kevcheng@chromium.org>
Tested-by: Kevin Cheng <kevcheng@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
2 files changed