Remove the kill -9 in jstop() from [f49071585e] as it is redundant.

I was unable to reproduce the original problem that resulted in this
being added.
Record pid of nohang() child for cleanup() to prevent waiting for it

This fixes hitting ^C in testport during long package phases (such as
with boost-libs) causing the pkg-static to keep running and not
exit poudriere until pkg-static is done. A ^C should at minimum
send a SIGTERM to every child process ASAP
Fix typo

Reported by:	miwi