spawn: more CLOEXEC fixes
spawn: another cleanups in spawn_and_give_stdout()
spawn: reshuffle code to get proper stdin for spawned process
spawn: allow spawnv stdout/stderr redirection to logs
spawn: implement spawn_kill, improve IPTV pipe (busy loop)
linuxdvb,satip,hdhomerun: make uuid persistent per tuner
hdhomerun: remove hf_master code - not used