largefiles: avoid printing messages while rebasing by "_lfstatuswriters"
Putting "lambda *msg, **opts: None" (= avoid printing messages always)
into "_lfstatuswriters" while rebasing makes explicit passing
"printmessage = False" for "updatelfiles()" useless.
This patch also removes setting/unsetting "repo._isrebasing" in
"overriderebase", because there is no code path referring it.
#require serve killdaemons
#if windows
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
#else
$ hg clone http://localhost:$HGPORT/ copy
abort: error: Connection refused
[255]
#endif
$ test -d copy
[1]
$ python "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ "$TESTDIR/killdaemons.py" $DAEMON_PIDS