Move EE Concurrency Transaction Resources to EE Subsystem

All the stuff in the transaction subsystem should be moved to the ee subsystem.

The only reason the org.jboss.as.txn.ee.concurrency package is in the tx subsystem is to use TransactionManagerService.INTERNAL_SERVICE_NAME to inject a TransactionManager. That should not be necessary.

In the ee subsystem code:

Check for capability "org.wildfly.transactions.global-default-local-provider". If not present the transaction subsystem is not present, and skip the rest.
Don't inject the TM. Just add a non-injection requirement for the "org.wildfly.transactions.global-default-local-provider" capability. This ensures the tm stuff is ready before your service.
Instead of using injection of the TM, directly use org.wildfly.transaction.client.ContextTransactionManager.getInstance(). That's what TransactionManagerService.getValue() provides, so doing it directly is the same as injecting it.
Note that the above is the way access to the TM is meant to be handled; it's not a hack to avoid forking. See comment above TransactionManagerService.SERVICE_NAME.