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

Remove the '[build_sphinx]' section as described in:
http://lists.openstack.org/pipermail/openstack-dev/2018-March/128594.html

Change-Id: Ia8e8d6b4e23c2737a9e948e7c4b682dca697f6a4

setup.cfg

@@ -85,12 +85,6 @@ oslo.config.opts.defaults =
 oslo.policy.policies =
     sahara = sahara.common.policies:list_rules
 
-[build_sphinx]
-all_files = 1
-build-dir = doc/build
-source-dir = doc/source
-warning-is-error = 1
-
 [extract_messages]
 keywords = _ gettext ngettext l_ lazy_gettext
 mapping_file = babel.cfg

test-requirements.txt

@@ -11,15 +11,10 @@ coverage!=4.4,>=4.0 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
-openstackdocstheme>=1.18.1 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
-os-api-ref>=1.4.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
 psycopg2>=2.6.2 # LGPL/ZPL
 pylint==1.4.5 # GPLv2
-reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
-sphinxcontrib-httpdomain>=1.3.0 # BSD
 testresources>=2.0.0 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -27,6 +27,11 @@ basepython = python3.5
 commands = oslo_debug_helper -t sahara/tests/unit {posargs}
 
 [testenv:pep8]
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/requirements.txt
+  -r{toxinidir}/test-requirements.txt
+  -r{toxinidir}/doc/requirements.txt
 commands =
     flake8 {posargs}
     doc8 doc/source
@@ -47,22 +52,26 @@ sitepackages = True
 commands = {posargs}
 
 [testenv:docs]
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/doc/requirements.txt
 commands =
     rm -rf doc/html doc/build
     rm -rf api-ref/build api-ref/html
     rm -rf doc/source/apidoc doc/source/api
-    python setup.py build_sphinx
+    sphinx-build -W -b html doc/source doc/build/html
     sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
-whitelist_externals =
-    rm
+whitelist_externals = rm
 
 [testenv:api-ref]
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/doc/requirements.txt
 install_command = pip install -U --force-reinstall {opts} {packages}
 commands =
   rm -rf api-ref/build api-ref/html
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
-whitelist_externals =
-    rm
+whitelist_externals = rm
 
 
 [testenv:pylint]
@@ -75,7 +84,13 @@ commands =
     --output-file etc/sahara/sahara.conf.sample
 
 [testenv:releasenotes]
-commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+deps =
+  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -r{toxinidir}/doc/requirements.txt
+commands =
+  rm -rf releasenotes/build releasenotes/html
+  sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
+whitelist_externals = rm
 
 [testenv:pip-missing-reqs]
 # do not install test-requirements as that will pollute the virtualenv for