vcs: dedup auth code between Hg and Git middleware There's a lot of verbatim duplicated code in the Hg and Git VCS middleware. This attempts to deduplicate a bit of it. The _authorize function is a bit awkward, but for now the goal is simply to remove duplicated code, not improving program structure and design. As such, the code in _authorize is almost a verbatim copy of the code removed in the two controllers.

[tox]
minversion = 1.8
envlist = py{26,27}-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    py26-pytest: unittest2
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}