tests/test-extra-filelog-entry.t

py3: port test-batching.py to python3

I used byteify-strings.py on this file, then manually added the
various pycompat and bprint bits as needed.

Differential Revision: https://phab.mercurial-scm.org/D5678

Issue351: mq: qrefresh can create extra revlog entry

  $ echo "[extensions]" >> $HGRCPATH
  $ echo "mq=" >> $HGRCPATH

  $ hg init
  $ hg qinit

  $ echo b > b
  $ hg ci -A -m foo
  adding b

  $ echo cc > b
  $ hg qnew -f foo.diff
  $ echo b > b
  $ hg qrefresh

  $ hg debugindex b
     rev linkrev nodeid       p1           p2
       0       0 1e88685f5dde 000000000000 000000000000