Two small optimizations to TransactionUtil:
* since the information stored in allThreadsTransactionBeginStack and allThreadsTransactionBeginStackSave was only used when the log INFO level was ON, now they are not populated if it is OFF
* instead of reading the value of debugResources from EntityConfig everytime, now it does only at initialization


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/framework-api-cleanup@1620280 13f79535-47bb-0310-9956-ffa450edef68