git: make sure _check_url only accept the protocols accepted by is_valid_repo_uri Avoid unnecessary flexibility, ambiguity, and complexity. The file protocol was never used. But when cloning existing managed repos, is_valid_repo_url would be skipped and _check_url would be called with absolute paths.

[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}