Fixes#602.
I replaced the SIGKILL with a SIGINT, and then catch SIGINT with a
handler. This handler calls cancelSubs if necessary, and can later be
edited to perform other clean-up operations, too. I thought about, in
this same commit, changing the SIGTERM in
maybe_restart_mirroring_script to a SIGINT, but after tracing out the
code paths, I realized that isn't necessary. (The SIGTERM is
necessarily performed on a process that has not subscribed to any
zephyr classes, so cancelSubs is unnecessary. If we do think that we
may want to add additional clean-up operations in the future, though,
then it might be worth investigating changing this SIGTERM.)
(imported from commit 692b295be6cb40b0e4ec2ca0bc58c58056ed9bd9)
Bots are not part of what we distribute, so put them in the repo root.
We also updated some of the bots to use relative path names.
(imported from commit 0471d863450712fd0cdb651f39f32e9041df52ba)