Add tox configuration items

Update tox.ini to pull in the openstack upper constraints when
installing the environment for the releasenotes and pull in the
test-requirements.txt as well

Change-Id: I84f23b7218c5b2da70f8c47efdc1645d625c827e
Depends-On: I326f27e880bc9717243258044496d42de50b6972

moduleroot/.gitignore

@@ -9,6 +9,10 @@ coverage/
 *.swp
 *.iml
 openstack/
+
+# Files created by releasenotes build
+releasenotes/build
+.tox
 <% if ! @configs['paths'].nil? -%>
 <% @configs['paths'].each do |path| -%>
 <%= path %>

moduleroot/test-requirements.txt

@@ -0,0 +1,6 @@
+# this is required for the docs build jobs
+sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
+oslosphinx>=2.5.0 # Apache-2.0
+# This is required for the releasenotes build jobs
+# FIXME: reno is manually pinned to !=2.0.0 because of bug #1651995
+reno>=1.8.0,!=2.0.0  # Apache-2.0

moduleroot/tox.ini

@@ -0,0 +1,11 @@
+[tox]
+minversion = 1.6
+skipsdist = True
+envlist = releasenotes
+
+[testenv]
+install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+
+[testenv:releasenotes]
+deps = -rtest-requirements.txt
+commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html