vcs: restructure authorization check This is a pure refactoring, except for some changed debug log messages. With this change, we simply return early if anonymous (= default user) access is enabled, which should help overall readability. (Diff becomes clearer if whitespace changes are ignored.)

[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}