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

Change-Id: Ia8a5a4eb2770976ac7b3b99c6d32d8aa37cedac7

doc/requirements.txt

@@ -0,0 +1,3 @@
+openstackdocstheme>=1.18.1 # Apache-2.0
+reno>=2.5.0 # Apache-2.0
+sphinx!=1.6.6,>=1.6.2 # BSD

setup.cfg

@@ -31,15 +31,6 @@ packages =
 data_files =
     libexec/kuryr = usr/libexec/kuryr/*
 
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-warning-is-error = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
 [compile_catalog]
 directory = kuryr/locale
 domain = kuryr

test-requirements.txt

@@ -7,11 +7,8 @@ coverage!=4.4,>=4.0 # Apache-2.0
 ddt>=1.0.1 # MIT
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0
-openstackdocstheme>=1.18.1 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
-reno>=2.5.0 # Apache-2.0
-sphinx!=1.6.6,>=1.6.2 # BSD
 testrepository>=0.0.18 # Apache-2.0/BSD
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT

tox.ini

@@ -54,7 +54,8 @@ commands =
 
 [testenv:docs]
 basepython = python3
-commands = python setup.py build_sphinx
+deps = -r{toxinidir}/doc/requirements.txt
+commands = sphinx-build -a -E -W -d doc/build/doctrees -b html doc/source doc/build/html
 
 [flake8]
 # E125 continuation line does not distinguish itself from next logical line