Refactor initialisation of the daemon

This commit prepares a future job centrered
main where 'sig_monitor_init', 'jobs_init',
'jobs_add_events', 'jobs_queue0' and 'jobs_add_me'
will be merged in one single call provided as
a feature of module jobs.

Change-Id: I8ccb1bf1761c4fa1031e903bead863ff68e7df83
Signed-off-by: José Bollo <jose.bollo@iot.bzh>