prosody: do not drive the service through prosodyctl

prosody: do not drive the service through prosodyctl

prosodyctl refuses start, stop, restart and reload once it detects an
init system, and /etc/init.d/prosody makes that detection always true.
The refusal is fatal, so the service could neither be started nor
stopped:

  ERROR: Use of 'prosodyctl stop' is disabled in this installation
         because we detected that this system uses rc.d for managing
         services.

Let procd supervise the daemon directly with -F instead, and reload the
configuration with SIGHUP, which is what prosody expects.

Signed-off-by: Josef Schlehofer <redacted>