Remove unneeded @pytest.mark.network in test_vcs_git.py.
Remove unneeded @pytest.mark.network in test_vcs_git.py.

xavfernandez/pip,pypa/pip,pfmoore/pip,rouge8/pip,rouge8/pip,pradyunsg/pip,pfmoore/pip,xavfernandez/pip,sbidoul/pip,xavfernandez/pip,sbidoul/pip,pradyunsg/pip,pypa/pip,rouge8/pip