MODE-2266 Added more performance tests for adding lots of nodes, both in deep and flat hierarchies.

Conflicts:
	modeshape-performance-tests/src/test/resources/config/infinispan-jdbc.xml
	modeshape-performance-tests/src/test/resources/config/infinispan-leveldb-jbosstxn.xml
Merge pull request #1200 from hchiorean/MODE-2266

MODE-2266 Added more performance tests for adding lots of nodes, both in deep and flat hierarchies.