Add venv tox environment
This environment is used by the normal docs job, add it.
Manually add requirements needed for doc building.
Change-Id: I1be193d113683966f6a76e862713f3a550543168
diff --git a/tox.ini b/tox.ini
index e8e7d7e..dbd1652 100644
--- a/tox.ini
+++ b/tox.ini
@@ -49,3 +49,13 @@
TOP_DIR={toxinidir}
commands =
python setup.py build_sphinx
+
+[testenv:venv]
+deps =
+ pbr>=0.6,!=0.7,<1.0
+ sphinx>=1.1.2,<1.2
+ oslosphinx
+ blockdiag
+ sphinxcontrib-blockdiag
+ sphinxcontrib-nwdiag
+commands = {posargs}