main/openssh: fix init.d script to also look in sshd_config.d/*.conf
With 3903cd46 , users are incentivized to
put directives like UsePAM
in /etc/ssh/sshd_config.d/*.conf
instead of
/etc/ssh/sshd_config
itself, so tweak the init.d script to also look at
those files.
Fixes #15169 (closed)