Support for .pem keys

[fuster92]

Is your feature request related to a problem? Please describe.
Trying to use a private key with .pem extension gives the following error:

error: failed to parse `path/to/key.pem`
  ssh: not an encrypted key

Describe the solution you'd like
To be able to define servers that use .pem private key files

[alajmo]

Could you provide some more information:

• do you use a passphrase (if not, then the key isn't encrypted)?
• how do your config files look for the server (if you use any of the identity_file, password keys)
• I recently fixed a small issue with identity_file not picked up when setting it via the config, could you try with --identity-file instead until I cut a new release
• How did you generate your pem file, would be helpful so I could reproduce the issue

[alajmo]

I've fixed some small issues with auth, please check if it works now with version v0.1.8.

[alajmo]

Should work now, please re-open or create a new issue if the bug persists.

[fuster92]

Sorry for the late response
There was a problem with the key having the .pem extension and not being actually encrypted, if I rename it, with the latest version it works now.
I'd say that with the previous version the key failed even changing names, but I've forgot if that was the case.

[alajmo]

Great, I don't think Go's SSH library and OpenSSH actually look at the filename to determine key type, format or if it's encrypted, it's all there in the file content.