tests/test-gendoc-it.t

hg-ssh: normalize the drive of the current working directory on windows

For some reason os.getcwd() can return either `c:` or `C:`. We normalize this to
`C:` and the like. This fix `test-ssh-bundle1.t` on windows.

Differential Revision: https://phab.mercurial-scm.org/D11042

#require docutils gettext

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