tests/test-gendoc-pt_BR.t

debugcommands: introduce debugpeer command

`hg debugpeer <path>` will establish a connection to a peer repository
and print information about it.

If you add --debug, it will log low-level protocol request info. This
will be useful for upcoming tests around protocol handshaking.

Differential Revision: https://phab.mercurial-scm.org/D2025

#require docutils gettext

  $ $TESTDIR/check-gendoc pt_BR
  checking for parse errors