remotefilelog: rework workaround for sshpeer deadlocks
The wrapping of `sshpeer.cleanup` silently broke when `cleanup` was
renamed to `_cleanup`, a couple of years ago.
I don't know what `orig.im_self` is, but regardless, the intention of
the wrapping seems pretty clear: close stderr before
sshpeer._cleanuppipes blocks on it. So do that.
Differential Revision: https://phab.mercurial-scm.org/D9997
#require rustfmt test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "$TESTDIR"/..
$ RUSTFMT=$(rustup which --toolchain nightly-2020-10-04 rustfmt)
$ for f in `testrepohg files 'glob:**/*.rs'` ; do
> $RUSTFMT --check --edition=2018 --unstable-features --color=never $f
> done