initctl: Show available services if none given
initctl: Show available services if none given

In case a user forgets to type in the service to enable, disable, or
touch, we try to be helpful and list available services instead of
bugging out.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit