Remove pbr warnerrors in favor of sphinx check

This change removes the now unused "warnerrors" setting,
which is replaced by "warning-is-error" in sphinx
releases >= 1.5[0]. This also fixes any warnings
that came up when testing with the latest version
of sphinx:

- Redundant loading of todo extension
- Empty man_pages config value

Also updated the requirements for pbr and sphinx to the latest
version(s) in requirements.txt

With this change, any doc warnings will cause the build to fail
[0] http://lists.openstack.org/pipermail/openstack-dev/2017-March/113085.html

Change-Id: Id828161e866da6766d88ce553a3c5ea2593b8f84

doc/source/conf.py

@@ -28,7 +28,6 @@ import os
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
 extensions = ['sphinx.ext.autodoc',
-              'sphinx.ext.todo',
               'sphinx.ext.viewcode',
               'oslosphinx',
               'yasfb',
@@ -93,9 +92,6 @@ pygments_style = 'sphinx'
 # A list of ignored prefixes for module index sorting.
 modindex_common_prefix = ['mogan-specs.']
 
-# -- Options for man page output ----------------------------------------------
-man_pages = []
-
 # -- Options for HTML output ---------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for

requirements.txt

@@ -1,6 +1,6 @@
 oslosphinx>=2.2.0.0a2
-pbr>=0.6,!=0.7,<1.0
+pbr>=2.0.0,!=2.1.0
-sphinx>=1.1.2,<1.2
+sphinx>=1.5.1,!=1.6.1
 testrepository>=0.0.18
 testtools>=0.9.34
 yasfb>=0.5.1

setup.cfg

@@ -15,6 +15,8 @@ classifier =
 source-dir = doc/source
 build-dir = doc/build
 all_files = 1
+builders = html
+warning-is-error = 1
 
 [pbr]
 warnerrors = True