tests/test-bad-pull.t

run-tests: fix permission to clean up unreadable directories

I found many hgtests.* directories left in $TMPDIR, which couldn't be deleted
because test-ssh-repoerror.t created some directories with a-rx mode.

#require serve

  $ hg clone http://localhost:$HGPORT/ copy
  abort: * (glob)
  [255]

  $ 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]
  $ killdaemons.py