Update HighlyAvailableGraphDatabase.java

I am from Alcatel-Lucent, we have a contract with Neo4j and we discussed this change with Max De Marzi.
We desperately need to know the current master info and state changes on slaves/master.
This is our work emails: Atta.Zabihi@alcate-lucent.com , Felix.Katz@alcatel-lucent.com