option to require FQDN

As we have run into numerous cases now where the device name uniqueness requirement has bitten us, my recommendation to LM is now this:

   * add a portal option to require a FQDN for all devices -- failure to include would cause rejection
   * add an option to have a default FQDN suffix defined as a group property which would be used when adding a new device within that group

I am not sure what to suggest for Websites and the new Services naming, but similar issues apply, especially for the current RBAC-based MSP model.