Sometime back, I made modifications to the original generic CloudStack cloud-set-guest-password and cloud-set-guest-sshkey to make them work on other Linux distros and FreeBSD. You can find them on Github.
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Tag: SuSE
The Working with Templates section from the CloudStack Administrators Guide describes in broad strokes how to create OS templates. In addition to the steps mentioned there, you might need an extra step to update the hostname settings during DHCP depending on the Linux distribution.