Update Sphinx conf.py; add autodoc extension

Change-Id: I4754d7d2203da2d9364d11aca65474eb29505fbf
diff --git a/.pylintrc b/.pylintrc
index 98e73bf..cac6c64 100644
--- a/.pylintrc
+++ b/.pylintrc
@@ -279,7 +279,7 @@
 
 # Regular expression matching correct constant names. Overrides const-naming-
 # style.
-#const-rgx=
+const-rgx=^(_?[A-Z][A-Z0-9_]*|__[a-z0-9_]+__|_?[a-z][a-z0-9_]*)$
 
 # Minimum line length for functions/classes that require docstrings, shorter
 # ones are exempt.