main-afb-daemon: manage listening interfaces

This change allows to specify interfaces to serve
explicitely.

By default the option --port=PORT lead to serving
interface of specification "tcp:*:PORT". Meaning
that all interfaces are listened.

This is intended to be used with localuser family
of hostnames.

Bug-AGL: SPEC-2968

Signed-off-by: José Bollo <jose.bollo@iot.bzh>
Change-Id: I3fb2a77a5c03dd4c2118ebe3267794f79bfc0262