Addresses #8579
I might be getting the hang of **_find and replace_** now. 😝
This doesn't touch a couple that ref 2.2.0. I'll tidy those up on https://github.com/aspnet/Docs/issues/8518 after 2.2 RTM.
Fixes#8514
* Convert use of local time to UTC.
* I went for some naming upgrades and consistency.
* I prefer not to post-fix types on variable names (i.e., "String" here).
* I add "UTC" here and there tho to clarify what's held in vars and the cache key.
* Opened **Distributed cache topic UE pass** #8702 to do a pass on the topic later.
Luke Latham
Rick Anderson
Daniel Roth