Sysprepping an AMI Instance

[Paul Brushwood]

I've been trying to get a packer build to sysprep the EC2 instance before creating an AMI from it with no success.  I tried following the example here https://gist.github.com/mefellows/a7a5ef98a3ec21a2c972 with the exception that I am not setting Ec2SetComputerName to Yes since I want a random hostname rather than the hostname based on the ip address.  Sysprep is not running for me.  Has anyone gotten the above sample working?  The way I interpret it, is that sysprep should be run when creating the AMI if those settings are set and there's no need to explicitly invoke it.  

[John Culkin]

I am having the same issue - there has got to be a better way