This commit addresses some left over admin partition FIXMEs
1. Adds Partition correctly to Service Instances
2. Converts non-important 'we can do this later' FIXMEs to TODOs
3. Removes some FIXMEs that I've double checked and addressed.
Most of the remaining FIXMEs I'm waiting on responses to questions from
the consul core folks for. I'll address those in a separate PR.
1b9586b65e