Ensures logging is enabled in Arbiter instances

Adds logging service in the lifecycle of StandaloneClusterClient and starts it, making
 logging available in arbiter instances
Sets log file for arbiter to data/log/arbiter/messages.log
Slight formatting - whitespace and commented out code
Merge pull request #768 from digitalstain/master

Ensures logging happens in Arbiter instances
Merge remote-tracking branch 'upstream/master'