Once files moved to aos folder and files updated accordingly

Change-Id: Idd26fca1d4dc15407e92859400e1a15a8a142ec3
diff --git a/y2017/BUILD b/y2017/BUILD
index 11b965e..4163bd5 100644
--- a/y2017/BUILD
+++ b/y2017/BUILD
@@ -13,7 +13,7 @@
     '//aos/common/logging',
     '//aos/common/network:team_number',
     '//aos/common:mutex',
-    '//aos/common:once',
+    '//aos:once',
     '//frc971:constants',
     '//frc971/shooter_interpolation:interpolation',
     '//y2017/control_loops/drivetrain:polydrivetrain_plants',
diff --git a/y2017/constants.cc b/y2017/constants.cc
index e2b743b..9530e27 100644
--- a/y2017/constants.cc
+++ b/y2017/constants.cc
@@ -13,7 +13,7 @@
 #include "aos/common/logging/logging.h"
 #include "aos/common/mutex.h"
 #include "aos/common/network/team_number.h"
-#include "aos/common/once.h"
+#include "aos/once.h"
 
 #include "y2017/control_loops/drivetrain/drivetrain_dog_motor_plant.h"
 #include "y2017/control_loops/drivetrain/polydrivetrain_dog_motor_plant.h"