ssh_secure: Don't alias "ssh" to "ssh -o 'StrictHostKeyChecking yes'

ssh_secure: Don't alias "ssh" to "ssh -o 'StrictHostKeyChecking yes'

Creating this alias prevents the user from overwriting this for certain
hosts in his ~/.ssh/config file.

You should add something like the folloging to you ~/.ssh/config file
to make ssh more secure by default:

    # Trusted test network with changing hosts
    Host *.example.net
        StrictHostKeyChecking no
        UserKnownHostsFile /dev/null

    # Be more secure by default!
    Host *
        CheckHostIP yes
        StrictHostKeyChecking yes