main, main-no-init: rid of D-Bus SIGPIPE handler
control-request: uninitialized/unused variables
control-request: comment out jobs used incrementor for now
control-request: default case and don't return from signals
core: major overhaul of signal handlers

The FIFO model doesn't seem to play well with the former signal handlers. As such,
we throw away many of the basic "start a target" type of signals and refactor the switch-root/
kexec/reexec procedures, among other things including curbing watchdog timeouts, as in main-no-init.
control-request/response: fix up some types
control-request: add a break in list-jobs
manager: signals are now control commands, turn them off