Fix high priority findbugs warnings.

This jenkins report showed 5 high priority findbug warnings which this PR fixes. I chose to fix the warning about logger needing to be final by making it private like the other uses of Logger.

http://hudson.rhq.lab.eng.bos.redhat.com:8080/hudson/view/chainsaw/job/candlepin-findbugs/39/findbugsResult/HIGH/