Restart of HIVE_ON_TEZ causes a Knox topology redeploy

A restart of HIVE_ON_TEZ triggers a topology redeploy: gateway.log contains the following line, even though there was no configuration change.

Role property hive.server2.use.SSL value has changed from true to null 

Possibly caused by HiveServiceModelGenerator pushing the service level hive.server2.use.SSL setting to the role level, while PollingConfigurationAnalyzer not doing so.