application config system property support changes

Author: ran-jit

src/main/resources/redis-data-cache.properties

@@ -1,5 +1,7 @@
 #-- Redis data-cache configuration
 
+# - ${ENV_VARIABLE_NAME}
+
 #- redis hosts. ex: 127.0.0.1:6379, 127.0.0.2:6379, 127.0.0.2:6380, ....
 redis.hosts=127.0.0.1:6379