caucase.wsgi: Disable pylint complaint about depreated module

This is a BBB codepath.

caucase/wsgi.py

@@ -51,7 +51,7 @@ if sys.version_info[0] >= 3: # pragma: no cover
   from html import escape
 else: # pragma: no cover
   # BBB: py2.7
-  from cgi import escape
+  from cgi import escape # pylint: disable=deprecated-module
 # pylint: enable=import-error,no-name-in-module
 
 __all__ = ('Application', 'CORSTokenManager')