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/starter/starter_cmd.cc b/aos/starter/starter_cmd.cc
index 65861e1..b4d80d8 100644
--- a/aos/starter/starter_cmd.cc
+++ b/aos/starter/starter_cmd.cc
@@ -13,7 +13,7 @@
 #include "gflags/gflags.h"
 #include "starter_rpc_lib.h"
 
-DEFINE_string(config, "./config.json", "File path of aos configuration");
+DEFINE_string(config, "./aos_config.json", "File path of aos configuration");
 // TODO(james): Bash autocompletion for node names.
 DEFINE_string(
     node, "",