ISPN-3778 ClusteredCacheWithAsyncDirTest throws lots of "org.h2.jdbc.Jdb...

...cSQLException: Unique index or primary key violation"

The jdbc cache stores of two nodes collide using the same in-memory H2 database instance. The config file should not specify hardcoded jdbc connection pool settings; these should rather be set in code ensuring a unique database name for each each node.

Jira: https://issues.jboss.org/browse/ISPN-3778