Update DerbyUtils.java

[JENKINS-21150]
Fixed Error where when Log stated DB failed to shutdown when it was actually shutting down properly
Modified DERBY_DB_FOLDER is now a format string. 
DerbyUtils.createDBConnection now takes a DBname as a parameter
DerbyUtils.shutdownDB now takes a DBName as a parameter
re-scoped DERBY_DB_FOLDER access to private 
	- These variables should only be used by Derby Utils
	- If a DB Connection is needed use DerbyUtils.createDBConnection
	- If a DB should be sutdown use DerbyUtils.shutdownDB
Moved re-factored DerbyUtils