Update docs building

Update docs building:
* Switch to sphinx-build
* Update requirements for Sphinx and openstackdocstheme for
  python 3
* Remove unneeded doc and translation sections from setup.cfg

Change-Id: Ie6cae5b1e7b600a2b2396f403a8fa5a90e5f3463

setup.cfg

@@ -21,29 +21,6 @@ classifier =
 packages =
     neutron_tempest_plugin
 
-[build_sphinx]
-all-files = 1
-warning-is-error = 1
-source-dir = doc/source
-build-dir = doc/build
-
-[upload_sphinx]
-upload-dir = doc/build/html
-
-[compile_catalog]
-directory = neutron_tempest_plugin/locale
-domain = neutron-tempest-plugin
-
-[update_catalog]
-domain = neutron-tempest-plugin
-output_dir = neutron_tempest_plugin/locale
-input_file = neutron_tempest_plugin/locale/neutron_tempest_plugin.pot
-
-[extract_messages]
-keywords = _ gettext ngettext l_ lazy_gettext
-mapping_file = babel.cfg
-output_file = neutron_tempest_plugin/locale/neutron_tempest_plugin.pot
-
 [entry_points]
 tempest.test_plugins =
     neutron_tests = neutron_tempest_plugin.plugin:NeutronTempestPlugin

test-requirements.txt

@@ -7,10 +7,10 @@ hacking<0.13,>=0.12.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 flake8-import-order==0.12 # LGPLv3
 python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx!=1.6.6,!=1.6.7,!=2.1.0,>=1.6.2  # BSD
+sphinx>=2.0.0,!=2.1.0 # BSD
 oslotest>=3.2.0 # Apache-2.0
 stestr>=1.0.0 # Apache-2.0
 testtools>=2.2.0 # MIT
-openstackdocstheme>=1.20.0 # Apache-2.0
+openstackdocstheme>=2.0.0 # Apache-2.0
 # releasenotes
 reno>=2.5.0 # Apache-2.0

tox.ini

@@ -13,8 +13,6 @@ setenv =
    OS_LOG_CAPTURE={env:OS_LOG_CAPTURE:true}
    OS_STDOUT_CAPTURE={env:OS_STDOUT_CAPTURE:true}
    OS_STDERR_CAPTURE={env:OS_STDERR_CAPTURE:true}
-install_command =
-  pip install {opts} {packages}
 deps =
   -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
@@ -41,7 +39,7 @@ commands =
     coverage xml -o cover/coverage.xml
 
 [testenv:docs]
-commands = python setup.py build_sphinx
+commands = sphinx-build -W -b html doc/source doc/build/html
 
 [testenv:releasenotes]
 commands =