Slave: Use pool's `shutdown` method during handoff
Slave: Use pool's `shutdown` method during handoff

Removes a duplicate piece of code accomplishing the same thing.

pedropapa/StreamMachine,StreamMachine/StreamMachine,SCPR/StreamMachine,pteich/StreamMachine,StreamMachine/StreamMachine,cdgraff/StreamMachine,cdgraff/StreamMachine,SCPR/StreamMachine,pedropapa/StreamMachine,pteich/StreamMachine