Create doc/requirements.txt

For compliance with the Project Testing Interface as described in:

https://governance.openstack.org/tc/reference/project-testing-interface.html

Refer to:

http://lists.openstack.org/pipermail/openstack-dev/2017-November/124815.html

Change-Id: I3d8c70f66931c15247b530ff7e1c89bfc753446f

doc/requirements.txt

@@ -0,0 +1,12 @@
+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+
+openstackdocstheme>=1.17.0 # Apache-2.0
+sphinx>=1.6.2 # BSD
+reno>=2.5.0 # Apache-2.0
+
+# imported when the source code is parsed for generating documentation:
+fixtures>=3.0.0 # Apache-2.0/BSD
+kafka-python>=1.3.1 # Apache-2.0
+pyngus>=2.2.0 # Apache-2.0

tox.ini

@@ -29,6 +29,7 @@ commands = {posargs}
 [testenv:docs]
 basepython = python2.7
 commands = python setup.py build_sphinx
+deps = -r{toxinidir}/doc/requirements.txt
 
 [testenv:py27-func-rabbit]
 setenv =
@@ -120,6 +121,7 @@ commands = pip-missing-reqs -d --ignore-module=oslo_messaging* --ignore-file=osl
 
 [testenv:releasenotes]
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+deps = -r{toxinidir}/doc/requirements.txt
 
 [testenv:bindep]
 deps = bindep