Support for reading Host alias from ssh_config.d directory

[FriendlyTroll]

Hi,

first thanks a lot for an amazing plugin.

This issue is related to this closed issue about reading github alias hosts from ssh config file. If you have a custom Host that you are using e.g. github-work and this is set in .ssh/config file it works fine.

Host github-work
  Hostname github.com
  IdentityFile ~/.ssh/sshkey-github

However I have some host configs split in different files and those are then included in .ssh/config like so

Include ~/.ssh/ssh_config.d/work.conf

Include ~/.ssh/ssh_config.d/private.conf

If the above host alias is located in any of the files in ~/.ssh/ssh_config.d you will get the error

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