[test-backend-jvstm-common] add more DML tests for jvstm-common
DRAFT: backend-jvstm-mem now extends from backend-jvstm-common
Add backend-jvstm-infinispan
DRAFT: backend-jvstm-mem remove deleted code that no longer overrides
DRAFT: backend-jvstm-ispn make backend-jvstm-ispn extend from jvstm-common