Make shading uniform accross instance and api (#2266)

diff --git a/heron/api/src/java/shade.conf b/heron/api/src/java/shade.conf
index 7ee86d0..3f6210b 100644
--- a/heron/api/src/java/shade.conf
+++ b/heron/api/src/java/shade.conf
@@ -1 +1 @@
-rule com.google** com.twitter.heron.__shaded__.@0
+rule com.google.protobuf** com.twitter.heron.shaded.@0