Change how fail_hard transactions are handled.

FIXES: #2847

* Transactions that are submitted with the fail_hard flag
  and that result in any TER code besides tesSUCCESS shall
  be neither queued nor held.

[FOLD] Keep tec results out of the open ledger when fail_hard:

* Improve TransactionStatus const correctness, and remove redundant
  `local` check
* Check open ledger tx count in fail_hard tests
* Fix some wrapping
* Remove duplicate test

src/ripple/ledger/ApplyView.h

@@ -32,6 +32,10 @@ enum ApplyFlags
 {
     tapNONE             = 0x00,
 
+    // This is a local transaction with the
+    // fail_hard flag set.
+    tapFAIL_HARD        = 0x10,
+
     // This is not the transaction's last pass
     // Transaction can be retried, soft failures allowed
     tapRETRY            = 0x20,