tests/test-issue1089.t

bundle2: introduce `replycaps` part for on-demand reply

The bundle2 processing does not create a bundle2 reply by default anymore.  It
is only done if the client requests it with a `replycaps` part. This part is
called `replycaps` as it will eventually contain data about which bundle2
capabilities are supported by the client.

We have to add a flag to the test command to control whether a reply is
generated or not.

http://mercurial.selenic.com/bts/issue1089

  $ hg init
  $ mkdir a
  $ echo a > a/b
  $ hg ci -Am m
  adding a/b

  $ hg rm a
  removing a/b (glob)
  $ hg ci -m m a

  $ mkdir a b
  $ echo a > a/b
  $ hg ci -Am m
  adding a/b

  $ hg rm a
  removing a/b (glob)
  $ cd b

Relative delete:

  $ hg ci -m m ../a

  $ cd ..