af-binder & af-main: Bump to version FF-rc4

af-binder & af-main: Bump to version FF-rc4

It include for the binder 3 important fixes:
SPEC-1668, SPEC-1669 and SPEC-1681.

Changes of app-framework-binder:
 * jobs: Abort when systemd's event loop lost
 * afb-stub-ws: Add reconnection of ws-clients on need
 * afb-stub-ws: Safe handling of deconnections
 * afb-stub-ws: Process error on call to remote
 * Send error replies on disconnection
 * afb-wsj1: Split 'wsj1_on_text' in 2
 * afb-stub-ws: Clean up
 * afb-api-ws: Use afb-socket features
 * afb-socket: Improvement
 * afb-stub-ws: Improve naming
 * hello3: Add mutebug
 * Set version to 5.99.FFRC4
 * Provide functions afb_service_call[_sync]_legacy

Changes of app-framework-main:
 * Set version to 5.99.FFRC4

Bug-AGL: SPEC-1668
Bug-AGL: SPEC-1669
Bug-AGL: SPEC-1681

Change-Id: I99b129a1722f1d3182205bc07de449b6ed034002
Signed-off-by: José Bollo <jose.bollo@iot.bzh>