dvb_support: add dvb_mux_conf_str()
dvb autodiscovery: more logs and improvements

- added logs for the scanfile mux creation
- added logs for the autodiscovery mux creation
- added logs for the autodiscovery mux changes
- use also symbol rate for the equal mux comparison
- handle the delivery system change (dvb-s / dvb-s2 switch for example)
convert config check to rule

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
add new caids

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
export and call mpegts_input_is_enabled

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
explicitly close all pids

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
always be verbose

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>
don't create new pid when closing pid

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>