Ssh: only look for *.conf files in /etc/ssh/ssh_config.d
Ssh: only look for *.conf files in /etc/ssh/ssh_config.d

The previous commit would have slurped in all files in that directory, but
only *.conf files are important.

Patch by Ian Mortimer

ptoscano/augeas,lutter/augeas,pevalme/augeas,kunkku/augeas,manandbytes/augeas,kunkku/augeas,manandbytes/augeas,lutter/augeas,mlichvar/augeas,hercules-team/augeas,hercules-team/augeas,pevalme/augeas,mchf/augeas,mlichvar/augeas,mlichvar/augeas,kunkku/augeas,ptoscano/augeas,pevalme/augeas,ptoscano/augeas,mchf/augeas,lutter/augeas