WFLY-3227 Replace batching="true|false" with <transaction mode="BATCH"/> in infinispan subsystem schema/model
WFLY-3540 Allow users to use web session clustering w/out batching
Change the schema version to 3.0.
See https://issues.jboss.org/browse/WFLY-3575
Minor cleanup of xsite integration tests
Rename SharedCacheResourceDefinition -> SharedStateCacheResourceDefinition, for consistency reasons.
Merge pull request #6470 from pferraro/batching

WFLY-3227 & WFLY-3540 Infinispan batching changes