Improve starter.sh script

stderr seems to be getting lost.  Redirect it to stdout so it becomes
visible.

While we are here, don't set PATH every time...  Also, symlink the
stderr log file into /tmp/ so it is easy to find.

Change-Id: I2ea1fb6b77832b115e45dcf097cba2d969026f43
diff --git a/aos/starter/starter.sh b/aos/starter/starter.sh
index cbbc09c..c5af65a 100755
--- a/aos/starter/starter.sh
+++ b/aos/starter/starter.sh
@@ -3,9 +3,10 @@
 # NI already has a core pattern, so we probably shouldn't change it.
 #echo '/home/driver/tmp/robot_logs/%e-%s-%p-%t.coredump' > /proc/sys/kernel/core_pattern
 
-ROBOT_CODE=/home/admin/robot_code
-cd $ROBOT_CODE
+ln -s /var/local/natinst/log/FRC_UserProgram.log /tmp/FRC_UserProgram.log
+ROBOT_CODE="/home/admin/robot_code"
+cd "${ROBOT_CODE}"
+export PATH="${PATH}:${ROBOT_CODE}"
 while true; do
-	export PATH=$PATH:$ROBOT_CODE
-	starter_exe $ROBOT_CODE/start_list.txt
+	starter_exe $ROBOT_CODE/start_list.txt 2>&1
 done