Add TRANSACTION_NONE support (#327)

Co-authored-by: Andy Pavlo <pavlo@cs.brown.edu>

Author: stonewhitener

src/main/java/com/oltpbenchmark/WorkloadConfiguration.java

@@ -305,6 +305,8 @@ public void setIsolationMode(String mode) {
             case "TRANSACTION_READ_UNCOMMITTED":
                 this.isolationMode = Connection.TRANSACTION_READ_UNCOMMITTED;
                 break;
+            case "TRANSACTION_NONE":
+                this.isolationMode = Connection.TRANSACTION_NONE;
         }
     }
 
@@ -317,6 +319,8 @@ public String getIsolationString() {
             return "TRANSACTION_REPEATABLE_READ";
         } else if (this.isolationMode == Connection.TRANSACTION_READ_UNCOMMITTED) {
             return "TRANSACTION_READ_UNCOMMITTED";
+        } else if (this.isolationMode == Connection.TRANSACTION_NONE) {
+            return "TRANSACTION_NONE";
         } else {
             return "TRANSACTION_SERIALIZABLE";
         }