cli: convert remainder of CLI to n_q_search_{messages,threads}_st

cli: convert remainder of CLI to n_q_search_{messages,threads}_st

I think it would be no real problem to cut and paste the gdb based
error message test from count to the other clients modified here, but
I'm not currently convinced it's worth the trouble since the code path
being tested is almost the the same, and the tests are relatively
heavyweight.