Put sumo_sources.json in the /opt/ dir (duracloud#182)

Author: dbernstein

resources/beanstalk/.ebextensions/sumo_logic.config

@@ -16,7 +16,7 @@ services:
         - /etc/sumo.conf
 
 files:
-  "/etc/sumo_sources.json":
+  "/opt/sumo_sources.json":
     mode: "000755"
     owner: root
     group: root