Include for sshd_config

[navern]

Hello,

Afaik there was added Include feature for ssh_config. I want to add this 
option to sshd_config as well. I think about local patch(i am not sure 
this will be required for upstream).

Code for Include option in readconf.c doesn't look very specific. Is 
there some reason why this wasn't introduced for sshd_config as well?

Maybe someone already have patch for this feature? It would be great 
because i am pretty awful C programmer.