Cache store properties shouldn't be changed

Currently Cache store properties may get changed according to the naming strategy, while they shouldn't. See link to source code.

As an example, with RocksDB store property 

<property name="data.write_buffer_size">64MB</property> the underscores get converted to dashes, as a result RocksDB will complain about an unknown property.

Note the dashes in error message: 

org.infinispan.commons.CacheConfigurationException: ISPN000294: RocksDB properties {write-buffer-size=64MB}, contains an unknown property