Add type to entropy info

Adding a type namespace to entropy info allows me to reuse it for
Yokozuna AAE status as well as future uses of AAE.
Export get_build_time

This function can be reused by Yokozuna.
Parametrize mod:fun to determine all exchanges

The exchanges that need to take place in Yokozuna are not the same as
those in KV.
Fix AAE filtering

Fix the filtering logic which removes AAE info for indices no longer
owned by the local node.  The key is now `{Type, Index}`.
Make sure AAE status is backwards compatible

Add functions which provide a default `Type` so that the riak_kv calls
can stay as they currently are.
Rollback unneeded file patch
Add default type for tree_built

Use default type of `riak_kv` when calling `tree_built/2`.
Merge pull request #654 from basho/feature/rz/generic-aae-status

Generic AAE Status