rpz test fails to launch ns2 on openbsd

on openbsd61-64 the rpz test emits errors when ran with sh run.sh rpz tested on master, v9_12, and the 9.12.1-P1 tarball

---output---
$ sh run.sh rpz
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
S:rpz:Thu May  3 20:05:18 PDT 2018
T:rpz:1:A
A:System test rpz
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
tput: not enough arguments (3) for capability `setaf'
I:Couldn't start server ns2 (pid=29602)
I:failed
kill: 29602: No such process
R:FAIL
E:rpz:Thu May  3 20:05:38 PDT 2018
---end output---

upon investigation, the setup.sh script is not successfully completing, which leads to ns2 failing to launch.