Update sshd_config to use Protocol 2

Had to write an script to update SSHD to only use protocol 2 without changing any of the other settings, to be deployed via BMC Bladelogic (horrible horrible tool), but you work with what you have. The script should work across Linux, AIX and Solaris.

$> SSHProtocolUpdate.sh update [1|2]
$> SSHProtocolUpdate.sh rollback

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