py3: remove safe_unicode in places where it no longer is needed because all strings (except bytes) already *are* unicode strings (The remaining safe_unicode calls are still needed and can't just be removed, generally because we in these cases still have to convert from bytes to unicode strings.)

[tox]
minversion = 1.8
envlist = py27-pytest

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