Previously cmd socket worked only with DVB input. That was ok
since there were no commands (well except SHUTDOWN and RELOAD)
that were useful without DVB input. Now that lots of commands
were added to deal with input stream, this patch allows cmd
socket to be used with any input (ASI, DVB and UDP). DVB only
commands are ignored when there is no DVB input used.
Signed-off-by: Georgi Chorbadzhiyski <gf@unixsol.org>