Remove default SSH host keys before publishing an AMI

AMIs that have the same ssh host key pairs as other public amis will be made private by amazon to prevent man-in-the-middle attacks, so always remove SSH Host Key Pairs (they will be regenerated with new unique keys automatically)

rm /etc/ssh/ssh_host_dsa_key
rm /etc/ssh/ssh_host_dsa_key.pub
rm /etc/ssh/ssh_host_key
rm /etc/ssh/ssh_host_key.pub
rm /etc/ssh/ssh_host_rsa_key
rm /etc/ssh/ssh_host_rsa_key.pub

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