Change SSH Version from 1 to 2

Note: SSH Server Usernames are case sensitive.

<SW>system-view
[SW]disp ssh server status
 SSH server: Enable
 SSH version : 1.99
 SSH authentication-timeout : 60 second(s)
 SSH server key generating interval : 0 hour(s)
 SSH authentication retries : 3 time(s)
 SFTP server: Disable
 SFTP server Idle-Timeout: 10 minute(s)
[SW]undo ssh server compatible-ssh1x
[SW]disp ssh server status
 SSH server: Enable
 SSH version : 2.0
 SSH authentication-timeout : 60 second(s)
 SSH server key generating interval : 0 hour(s)
 SSH authentication retries : 3 time(s)
 SFTP server: Disable
 SFTP server Idle-Timeout: 10 minute(s)