auth: avoid random auth_internal failures - add explicit import of auth_internal to user admin auth_internal would often have been loaded by the custom auth module loader and available as auth_modules.auth_internal ... but sometimes it wasn't and navigating to Add User would fail with: File '.../kallithea/controllers/admin/users.py', line 155 in new c.default_extern_type = auth_modules.auth_internal.KallitheaAuthPlugin.name AttributeError: 'module' object has no attribute 'auth_internal'

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

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    nose: nose
    pytest: pytest
commands =
    nose: nosetests {posargs}
    pytest: py.test {posargs}