* Use an Infinispan cache to maintain pending puts, which avoids
the need to control it's memory consumption in the critical path
of putFromLoad.
* This cache is shared by all regions, and it's configured with
aggressive expiration settings to avoid piling up pending put
operations.
* Added a 2LC stress test that tests behaivour and performance
of 2LC under multiple situations, such as entity inserts, updates,
find via PK, find via query and deletes.
* Some other minor performance enhancements, such as avoiding
classloader aware cache wrapper if using 2LC locally.
* Remove cache adapter to reduce construction of useless objects.
* Cache flagged caches in order to avoid recomputing decorated
caches all the time, which reduces memory consumption.
* Skip locking for timestamp updates and separate timestamp region
implementations for local vs clustered scenarios.
Brett Meyer
Jeremy Whiting
Galder Zamarreño
Strong Liu
Steve Ebersole
Sanne Grinovero
JPAV
Emmanuel Bernard
Gail Badner