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

For more detials information, please refer to:
http://lists.openstack.org/pipermail/openstack-dev/2017-December/125710.html

Change-Id: Ic7dad29922af2efed2188f3215f364719f0e19ae

doc/requirements.txt

@@ -0,0 +1,6 @@
+sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinxcontrib-httpdomain>=1.3.0 # BSD
+sphinxcontrib-blockdiag>=1.5.4 # BSD
+reno>=2.5.0 # Apache-2.0
+os-api-ref>=1.4.0 # Apache-2.0
+openstackdocstheme>=1.18.1 # Apache-2.0

setup.cfg

@@ -143,12 +143,6 @@ designate.notification.plugin =
   default = designate.notifications:Default
   audit = designate.notifications:Audit
 
-[build_sphinx]
-all_files = 1
-build-dir = doc/build
-source-dir = doc/source
-warning-is-error = 1
-
 [egg_info]
 tag_build =
 tag_date = 0

test-requirements.txt

@@ -10,18 +10,12 @@ mock>=2.0.0 # BSD
 os-testr>=1.0.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 requests-mock>=1.2.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
-sphinxcontrib-httpdomain>=1.3.0 # BSD
 testtools>=2.2.0 # MIT
-sphinxcontrib-blockdiag>=1.5.4 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 WebTest>=2.0.27 # MIT
 tempest>=17.1.0 # Apache-2.0
-reno>=2.5.0 # Apache-2.0
 # Bandit security code scanner
 bandit>=1.1.0 # Apache-2.0
-os-api-ref>=1.4.0 # Apache-2.0
 zake>=0.1.6 # Apache-2.0
-openstackdocstheme>=1.18.1 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0

tox.ini

@@ -38,9 +38,11 @@ commands =
   ostestr '{posargs}'
 
 [testenv:docs]
-basepython = python2.7
-commands = rm -rf doc/build
-           python setup.py build_sphinx
+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 -W -b html doc/source doc/build/html
 
 [testenv:cover]
 commands =
@@ -115,6 +117,10 @@ commands =
   sphinx-build -E -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
 
 [testenv:releasenotes]
+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 -a -E -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
 [testenv:venv]