Optimization: prepare config in init-time rather than in run-time

[PROger4ever]

Introduction:
There are some instructions in the code, that can be executed once in init-time rather than every time in running:

1. evictionConfig is been recreated every time in eviction-phase.
2. EvictionPolicy is being looked in map every time in eviction-phase. Map operations aren't so fast as we might think: they calculate hash, look object in buckets by the hash.
3. Something else?

Problem:
Probably, it's not reasonable to do these operations every time, because the config is been changed hardly ever after pool is created.

Possible solution:

1. Create such objects once in startEvictor(). So, when you change config - just restart evictor;
2. Make a new method to apply config changes. So, when you change config - just call the method;
3. Another solution?