remove f16 slave from jenkins.ovirt.org

we can now remove existing f16 ec2 slave ec2-107-22-43-118.compute-1.amazonaws.com. and add another f17 vm instead. best thing (if possible) will be to clone existing vm (ec2-107-22-79-162.compute-1.amazonaws.com), it will include all configuration and rpms installed to support all jobs. I assume that we can re-install one of the rhel62 vms as f17 also, unless we expect to run jobs on a rhel62 vm. Eyal.