af-binder: Fix error in synchronous calls

af-binder: Fix error in synchronous calls

There fixes a bug with an inversion between info
and error in implementation of synchronous calls,
leading to bad detection of errors.

Includes:
 * 6bb714c afb-xreq: Remove field 'listener'
 * d325856 afb-binding.h: Ensure json-c/json.h is sourced
 * 056c53d AFB.js: Improve default token discovery
 * daecef1 supervisor: Setup services for local API use
 * 687d90d Fix detection of error in call synchronous

Bug-AGL: SPEC-2697

Change-Id: I20cf2d5219e7cc962862b604e642610b0f8a75b1
Signed-off-by: José Bollo <jose.bollo@iot.bzh>