Cloudmock cleanup - preparation for EC2 tag-on-create

[rifelpet]

In order to add "tag-on-create" support for ec2 resources, cloudmock first needs to support recognizing and storing tags provided in ec2.Create* requests. This way a DescribeTags call will return the tags provided either by the resource's Create call or in a CreateTags call.

Additionally this sets up launch templates to use their lt- ID prefix so that we can get/set their tags more easily (now that #9519 is merged).

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[johngmyers]

/lgtm