Cache active versions from split modulestore

Description

This is the pointer to the course structure document that is the current published version.

These are NOT immutable
This happens multiple times per second globally (peaking at ~100-125 times per second per course).
So we would give it a cache life of a second or two, then every couple seconds we can update the cache.
Note that we will get a stampede of these as workers spin up. Though we anticipate this should be fine because memcache can handle that behavior.

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Reporter

David Ormsbee

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