Matterbridge does not use ssh private key to join ssh-chat

[troilus]

Describe the bug Matterbridge does not use ssh private key to join ssh-chat.

To Reproduce

1. Start a ssh-chat server with passphrase or with a public key whitelist.
2. ssh ssh-chat server address to join ssh-chat with private key.
3. Use matterbridge to join ssh-chat with private key.

Expected behavior Matterbridge use ssh private key to join ssh-chat.

Screenshots/debug logs [If applicable, add screenshots to help explain your problem. Use logs from running matterbridge -debug if possible.] (ssh: unable to authenticate, attempted methods [none keyboard-interactive], no supported methods remain)

Environment (please complete the following information):

• OS: CentOS7
• Matterbridge version: 1.25.2

[spectrapulse]

Hmm... I ran into this today and it kind of is an issue as it would kind of make the usage of ssh-chat less secure if you only want people to connect to it in the whitelist...