Closes #62 Upon taking the lead, OracleServer should make sure old Oracle is no longer taking connections.
Closes #62. Sanity check- when oracle becomes the lead, make sure it cannot connect to previously leading oracle.
Merge branch 'master' of https://github.com/keith-turner/Accismus into Accismus-62

Conflicts:
	modules/core/src/main/java/accismus/impl/OracleServer.java
Small change