Pylint Fixes

Update our version of pylint to use the latest version and update the
codebase to comply with the majority of the updates.

For now disable the additional checks for `super-with-arguments`,
`useless-object-inheritance`, `raise-missing-from`, `no-else-raise`,
`no-else-break`, `no-else-continue` to be consistent with the existing
codebase.

wa/framework/pluginloader.py

@@ -35,6 +35,7 @@ class __LoaderWrapper(object):
     def reset(self):
         # These imports cannot be done at top level, because of
         # sys.modules manipulation below
+        # pylint: disable=import-outside-toplevel
         from wa.framework.plugin import PluginLoader
         from wa.framework.configuration.core import settings
         self._loader = PluginLoader(settings.plugin_packages,