RSA authentication on MOSH protocol

[bitchecker]

Describe the bug
Using mosh protocol, is not possible to use RSA authentication.

To Reproduce
Steps to reproduce the behavior:

1. Create a new connection using MOSH protocol
2. Try to use Private Key authentication
3. See that Private Key is disabled ( not clickable )

Expected behavior
Setup rsa

Desktop (please complete the following information):

• OS: Fedora
• Version: 30

Additional context
I had open ad issue on PAC connection manager ( perseo22/pacmanager#74 ) forked and send a Pull Request ( perseo22/pacmanager#75 ) i think that the same code can be used here.

[gfrenoy]

PR #174 has been merged. Let us know if it works for you so we can close this issue.

Thanks again for your help and collaboration.

[bitchecker]

@gfrenoy It works properly...I have tested it before create pull request.

It's a pleasure to help when you can, also because I use this connection manager( also protocol and auth type ) in life and at work ( I'm a Unix SysAdmin! lol )