Determine if intermediate caching of property derived configurations can be simplified or removed.

As a follow-on to single node property storage in ZooKeeper (issue https://github.com/apache/accumulo/issues/1454)

The code contains multiple levels of caching configuration derived from properties. When the single node storage is implemented, the intermediate caching may no longer be necessary and code simplification / clean-up may be possible.

Possible candidate:

- The configuration caching in ServerConfigurationFactory.
- The handling and usage of updateCount in classes that extend AccumuloConfiguration.

Start with issue #1454 to understand the single-node property storage change, then inspect configuration caching in ServerConfigurationFactory and updateCount handling in AccumuloConfiguration subclasses. Determine whether the intermediate caches remain necessary and document the scope of any simplification or cleanup.

Written by the indexing model from the issue text.