Feature request: allow key file with password

[mgonzalez-summa]

I have some connections that requires key + password to connect, it would be really hepfull if you'd add this option.

[mgonzalez-summa]

I've found a workaround for this by adding extra arguments to connection using the log option to show the passphrase in connection command with -E mypassphrase then I simply copy/paste it in the same window and do not have to search for it, it's a hash.