Fix test 581-rtp

It was missing `checker-` on its name so it wasn't using the checker.
I verified that this is the only test missing checker- from its name
with `grep -rnw ./test/ -e "CHECK-START" | grep -v -e "checker-"`.

Also, I updated the test so that it passes the checker.

Change-Id: Ic097a4e32ce2d215cbe995aac511e518007109e6
5 files changed