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 [1].

[1] http://lists.openstack.org/pipermail/openstack-dev/
2017-March/113085.html

Change-Id: I9bf18ff72f36dfd3496b9672604e8bb98999b133

doc/source/conf.py

@@ -56,6 +56,12 @@ add_module_names = True
 # The name of the Pygments (syntax highlighting) style to use.
 pygments_style = 'sphinx'
 
+# Ignore the following warning: WARNING: while setting up extension
+# wsmeext.sphinxext: directive 'autoattribute' is already registered,
+# it will be overridden.
+suppress_warnings = ['app.add_directive']
+
+
 # -- Options for HTML output --------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  Major themes that come with

ironic_python_agent/hardware.py

@@ -775,7 +775,7 @@ class GenericHardwareManager(HardwareManager):
 
         :param node: Ironic node object
         :param ports: list of Ironic port objects
-        :raises BlockDeviceEraseError when there's an error erasing the
+        :raises BlockDeviceEraseError: when there's an error erasing the
                 block device
         """
         block_devices = self.list_block_devices()

setup.cfg

@@ -44,12 +44,12 @@ ironic_python_agent.inspector.collectors =
 
 [pbr]
 autodoc_index_modules = True
-warnerrors = True
 
 [build_sphinx]
 all_files = 1
 build-dir = doc/build
 source-dir = doc/source
+warning-is-error = 1
 
 [egg_info]
 tag_build =