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/y2017/vision/target_receiver.cc b/y2017/vision/target_receiver.cc
index ba09425..f21fe4e 100644
--- a/y2017/vision/target_receiver.cc
+++ b/y2017/vision/target_receiver.cc
@@ -20,7 +20,7 @@
   // TODO(parker): Have this pull in a config from somewhere.
   TargetFinder finder;
   aos::FlatbufferDetachedBuffer<aos::Configuration> config =
-      aos::configuration::ReadConfig("config.json");
+      aos::configuration::ReadConfig("aos_config.json");
 
   ::aos::ShmEventLoop event_loop(&config.message());