Add an option to remove the host+IP fingerprints in the known_hosts

[samuel-phan]

When the remote machine has a different fingerprint, we got a warning:

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
06:72:55:97:47:f0:44:9f:05:31:92:3a:49:6b:8f:06.
Please contact your system administrator.

After removing the entry builder (name of my remove VM), by typing:

mssh-copy-id -R builder

I can connect typing:

ssh builder

But I got a message saying that the IP of builder 10.0.0.10 is offending:

The authenticity of host 'builder (10.0.0.10)' can't be established.
ECDSA key fingerprint is 34:ca:2f:60:41:61:1a:a3:7d:d5:30:fc:b3:e7:1f:a4.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'builder' (ECDSA) to the list of known hosts.
Warning: the ECDSA host key for 'builder' differs from the key for the IP address '10.0.0.10'
Offending key for IP in /home/piloupy/.ssh/known_hosts:29
Are you sure you want to continue connecting (yes/no)? yes

Add an option -I to resolve the IPs of the given hostname and remove the IPs as well from the known_hosts.