serve: list tuners & feeders during CLI command 'check'

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>
Merge branch 'multirec' of github.com:mkrufky/libdvbtee
dvbtee v0.1.9           #gklst

Signed-off-by: Michael Krufky <mkrufky@linuxtv.org>