serve: correct meta variable of --daemon-pipefds option
It was changed to lock path at
e22695b4472f.
tests: have dumbhttp.py use cmdutil.service() to wait for child to listen()
Because the original dumbhttp.py exited without waiting for listen(), several
tests could fail with "abort: error: Connection refused" if subsequent hg
command is fast enough.
test-revert: remove obsolete comment about known misbehavior
It seems like the last known misbehvior that the comment was referring
to was dealt with in
2ff28e07d7d6 (revert: properly back up added
files with local modification, 2014-08-31).