Test specs jobs

Start with building Sphinx.

Change-Id: Ifb5eec24d7b0dea160b7bce20f96450919a03a0c
Signed-off-by: Dean Troyer <dtroyer@gmail.com>

.zuul.yaml

@@ -2,6 +2,7 @@
 - project:
     check:
       jobs:
+        - build-openstack-sphinx-docs
         - openstack-tox-linters
     gate:
       jobs:

doc/requirements.txt

@@ -0,0 +1,5 @@
+sphinx>=1.6.2
+openstackdocstheme>=1.19.0 # Apache-2.0
+
+# Release Notes
+reno>=0.1.1 # Apache2

doc/source/index.rst

@@ -0,0 +1,6 @@
+StarlingX Specs
+===============
+
+.. toctree::
+    :maxdepth: 2
+    :caption: Contents:

tox.ini

@@ -14,11 +14,8 @@ deps = -r{toxinidir}/test-requirements.txt
 
 [testenv:docs]
 basepython = python3
-deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
-  -r{toxinidir}/doc/requirements.txt
-commands =
-  sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
+deps = -r{toxinidir}/doc/requirements.txt
+commands = sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
 
 [testenv:linters]
 whitelist_externals = bash