af-binder & af-main: Update to version 5.99.FFRC6

af-binder & af-main: Update to version 5.99.FFRC6

This includes the following binder changes (from newer to older):
 * 29f544b afb-apiset: fixed the error message upon api open.
 * 8647a34 afb-session: Use ad-hoc pseudo-random uuid
 * d3edd5f VERSION 5.99.FFRC6
 * 72385ab main-afb-daemon: Export API after initialization
 * 408acbd app-framework-binder doc: Changed doc to fit new format.
 * a02a162 Allow choice to trap or not program faults
 * 5dd7df3 main-afb-daemon: Set AFB_ROOTDIR and AFB_WORKDIR in environment
 * 8706522 afb-hook-flags: Fix a compilation warning

Bug-AGL: SPEC-1655
Bug-AGL: SPEC-1724
Bug-AGL: SPEC-1694

Change-Id: I3d7b191322e6fbea94ea7345979f3b80da988d8c
Signed-off-by: José Bollo <jose.bollo@iot.bzh>