Follow the new PTI for document build

For compliance with the Project Testing Interface as described in:
https://governance.openstack.org/tc/reference/project-testing-interface.html
http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html

Change-Id: I3ffb5c54f5526a59b01da51e85c73170e4c973f4

doc/requirements.txt

@@ -0,0 +1,5 @@
+# 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>=1.18.1 # Apache-2.0
+sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD

doc/source/cli/index.rst

@@ -1,6 +1,6 @@
-=============================
- Command-line Tool Reference
-=============================
+===========================
+Command-line Tool Reference
+===========================
 
 In order to use the CLI, you must provide your OpenStack username,
 password, tenant, and auth endpoint. Use the corresponding

test-requirements.txt

@@ -5,8 +5,6 @@ hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
 oslotest>=3.2.0 # Apache-2.0
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD

tox.ini

@@ -35,6 +35,13 @@ commands = ./coverage.sh {posargs}
 [testenv:debug]
 commands = oslo_debug_helper -t solumclient/tests {posargs}
 
+[testenv:docs]
+deps =
+       -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+       -r{toxinidir}/requirements.txt
+       -r{toxinidir}/doc/requirements.txt
+commands = sphinx-build -b html doc/source doc/build/html
+
 [flake8]
 show-source = True
 builtins = _