Install builder signal handler so that it will respond to stop commands as expected.  We're still killing all of its child processes off hand but now we are expecting it to send "stop" commands out where necessary as well.
Install builder signal handler so that it will respond to stop commands as
expected.  We're still killing all of its child processes off hand but now we
are expecting it to send "stop" commands out where necessary as well.

fedora-conary/rmake-2,fedora-conary/rmake-2,fedora-conary/rmake-2,fedora-conary/rmake-2