Add random.json and fix in Repository

- The Repository.createAccount method was called with addresses from DataWord.NoLeadingZeroes, but they should be stored as 20 bytes, regardless. This might be fixed in a better way, but for now this fixes the random.json test. 

The code should be checked if there are any other locations where the Repository methods are called with byte-arrays with length < 20 bytes.
Why we create the account again ? 
it should be created in pre creation stage.
https://github.com/ethereum/ethereumj/blob/master/src/main/java/org/ethereum/jsontestsuite/TestRunner.java#L56