[autotest] Consolidate methods required to setup a scheduler.
Move methods/classes that will be helpful in setting up another scheduler
process into scheduler_lib:
1. Make a connection manager capable of managing connections.
Create, access, close the database connection through this manager.
2. Cleanup setup_logging so it's usable by multiple schedulers if they
just change the name of the logfile.
TEST=Ran suites, unittests.
BUG=chromium:344613
DEPLOY=Scheduler
Change-Id: Id0031df96948d386416ce7cfc754f80456930b95
Reviewed-on: https://chromium-review.googlesource.com/199957
Reviewed-by: Prashanth B <beeps@chromium.org>
Tested-by: Prashanth B <beeps@chromium.org>
Commit-Queue: Prashanth B <beeps@chromium.org>
9 files changed