factory_flow: Remove unused folders and delete shill core dumps.

Clear unused folders and delete shill core dumps so that we don't run
out of disk space on lab DUTs. This should get the lab DUTs up and
running again.

We can revert this CL after we figure out what is causing shill to crash.

BUG=chromium:447928
TEST=Manually in the lab.

Change-Id: I9faec51776d44aad0629218bcaf610f3485365de
Reviewed-on: https://chromium-review.googlesource.com/240125
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
2 files changed