init: Don't trap all signals

The main reason for removing the trap is to pass the the signal back to
the caller of the init script (systemd, sysV) to enable a better
debugging.

Change-Id: I4b7218ef80ac51834445477e1a57f5a64ca3dc2c
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>