Update docs building, Python 3 cleanup

Update docs building:
* Remove unneeded doc sections from setup.cfg
* Change constraints to use published document, use
  new variable
* Import mock from unittest, remove imports from future

Change-Id: I8f33d4c0bf5fcba203d410cd021c548219a757ec

openstack_releases/tests/test_new_release.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import unicode_literals
-
 from oslotest import base
 
 from openstack_releases.cmds import new_release

openstack_releases/tests/test_npmutils.py

@@ -12,13 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import unicode_literals
-
 import os
+from unittest import mock
 
 import fixtures
 import json
-import mock
 from oslotest import base
 
 from openstack_releases import npmutils

openstack_releases/tests/test_puppetutils.py

@@ -12,13 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import unicode_literals
-
 import os
+from unittest import mock
 
 import fixtures
 import json
-import mock
 from oslotest import base
 
 from openstack_releases import puppetutils

openstack_releases/tests/test_requirements.py

@@ -13,8 +13,8 @@
 #    under the License.
 
 import textwrap
+from unittest import mock
 
-import mock
 from oslotest import base
 import pkg_resources
 

openstack_releases/tests/test_validate.py

@@ -12,13 +12,11 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import unicode_literals
-
 import os
 import textwrap
+from unittest import mock
 
 import fixtures
-import mock
 from oslotest import base
 
 from openstack_releases.cmds import validate

openstack_releases/versionutils.py

@@ -12,8 +12,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from __future__ import unicode_literals
-
 import packaging.version
 import pbr.version
 

setup.cfg

@@ -42,13 +42,3 @@ console_scripts =
     check-schema = openstack_releases.cmds.check_schema:main
     find-gerrit-acl-issues = openstack_releases.cmds.find_gerrit_acl_issues:main
     get-contacts = openstack_releases.cmds.get_contacts:main
-
-[build_sphinx]
-source-dir = doc/source
-build-dir = doc/build
-all_files = 1
-builders = html
-warning-is-error = 1
-
-[upload_sphinx]
-upload-dir = doc/build/html

test-requirements.txt

@@ -12,6 +12,3 @@ testtools>=1.4.0 # MIT
 oslotest>=1.10.0 # Apache-2.0
 
 coverage>=4.0 # Apache-2.0
-
-# mocking framework
-mock>=2.0 # BSD

tox.ini

@@ -71,7 +71,7 @@ commands = {toxinidir}/tools/build_tag_history.sh {toxinidir}
 
 [testenv:docs]
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -c{env:TOX_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/requirements.txt
   -r{toxinidir}/doc/requirements.txt
 commands =