Bug 408067 - JPA tests using persistence unit "multi-tenant-123" fail on Sybase

- The multitenant context property [eclipselink.tenant-id] must be provided whenever the persistence unit "multi-tenant-123" is used outside the server.
- Sybase-specific behavior: JUnitTestCase.getEntityManagerFactory closes other EMFs when a new PU is passed. Must be considered in the test logic.