tests/test-revlog-raw.py.out

sshpeer: extract pipe cleanup logic to own function

So it can be used outside of instantiated classes. This is
needed to support pipe creation before __init__ is called.

Differential Revision: https://phab.mercurial-scm.org/D2029

local test passed
addgroupcopy test passed
clone test passed
lowlevelcopy test passed