Allow skipping bootstrap wait with Ctrl-C

When setting up a new system with Finit it is very common to make small
logical mistakes that cause "hangs" at boot.  This is when Finit waits
for 180 sec. for run/tasks to complete before moving to the configured
runlevel.  This patch adds console input monitoring during bootstrap
wait that allows users to press Ctrl-C to skip waiting and proceed to
the configured runlevel.

When Ctrl-C is detected, all incomplete run/task/services are logged
to syslog for later troubleshooting after login.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

src/service.h

@@ -48,6 +48,7 @@ void      service_step_all       (int types);
 void      service_worker         (void *unused);
 
 int       service_completed      (svc_t **svc);
+void      service_log_incomplete (void);
 void      service_notify_reconf  (void);
 
 void      service_init           (uev_ctx_t *ctx);