Changing test to separate test cases

- added four cases for both extended and mirrored mode as control files
- changed waiting to suspend and resume to cros_host methods test_wait_for_*()
- increased timeout to suspend

BUG=None
TEST=None

Change-Id: I085a50a4a4eae3b10503c40035e92be075471cbf
Reviewed-on: https://chromium-review.googlesource.com/296467
Commit-Ready: Kalin Stoyanov <kalin@chromium.org>
Tested-by: Kalin Stoyanov <kalin@chromium.org>
Reviewed-by: Wai-Hong Tam <waihong@chromium.org>
12 files changed