Expose reason info for SSH errors

[maxclaus]

I noticed that the reason info is not present in the UI error message when a SSH connection fails, and that field is usually more helpful than the description itself https://github.com/mscdex/ssh2/blob/v0.8.x/lib/client.js#L1206

Printing that info object directly from ssh2 module I could understand better why that was failing:

{
   recipient: 0,
   reasonCode: 1,
   reason: 'ADMINISTRATIVELY_PROHIBITED',
   description: 'open failed',
   lang: ''
}