Rename config.json to aos_config.json

Plenty of other things are called config.json, so let's pick a more
unique name.

Change-Id: I6510a172ec62674dd1b11bd71cef9aac2480c612
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/network/message_bridge_server.cc b/aos/network/message_bridge_server.cc
index 9f336c0..fc1425d 100644
--- a/aos/network/message_bridge_server.cc
+++ b/aos/network/message_bridge_server.cc
@@ -4,7 +4,7 @@
 #include "gflags/gflags.h"
 #include "glog/logging.h"
 
-DEFINE_string(config, "config.json", "Path to the config.");
+DEFINE_string(config, "aos_config.json", "Path to the config.");
 DEFINE_int32(rt_priority, -1, "If > 0, run as this RT priority");
 
 namespace aos {