OGM-595 Usability improvements around id generation strategies

* Setting AvailableSettings.USE_NEW_ID_GENERATOR_MAPPINGS by default in OgmConfiguration
* Making sure OGM's generators are used when working with the old generator mappings
OGM-595 Removing setting of property QUERY_STARTUP_CHECKING which is not required anymore
OGM-373 Create IT for RESOURCE_LOCAL configuration

  Currently, the integration between Neo4j and OGM does not work
  when deployed on WildFly using JTA.

  This commit changes the way the entityManager is managed  in
  the integration tests so that they can work when a persistence
  unit is set up to work with RESOURCE_LOCAL transactions.
OGM-373 Update IT in Neo4j using RESOURCE_LOCAL

  At the moment the integration between Neo4j and Wildfly is lacking
  when using persistence unit with JTA.

  Using the same integration tests of the other datastores requires that
  the persistence unit is set to RESOURCE_LOCAL