[autotest] Script to clear out all data from an autotest instance.

This provides a script to reset an autotest instance, i.e. a shard.

This is especially useful in case the master fails and all shards
need to be reset.

BUG=None
TEST=Manually.

Change-Id: I9e0003b1169500b4e3fa6f4eb2269a7815e57375
Reviewed-on: https://chromium-review.googlesource.com/219819
Tested-by: Jakob Jülich <jakobjuelich@chromium.org>
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Commit-Queue: Jakob Jülich <jakobjuelich@chromium.org>
1 file changed