Reap runner and sub-slave processes in slaves.
Reap runner and sub-slave processes in slaves.

When running a command, the runner process correctly waits for
termination of that command, but the slave also needs to wait for the
runner process. This adds a set of child pids that get waitpid'd
on (with WNOHANG) every time a command is read.

Lexxville/zeus,ylansegal/zeus,matrinox/zeus,burke/zeus,pelletencate/zeus,pelletencate/zeus,kgrz/zeus,burke/zeus,latortuga/zeus,matrinox/zeus,stripe/zeus,Lexxville/zeus,kgrz/zeus,latortuga/zeus,ylansegal/zeus,Lexxville/zeus,ylansegal/zeus,matrinox/zeus,burke/zeus,stripe/zeus,kgrz/zeus,stripe/zeus,pelletencate/zeus,latortuga/zeus