Adding support for json topics in PartitionFinalizer

Adding support for json topics in PartitionFinalizer
Adding support for hive table prefix if you want all your log tables to start with a prefix
Updating dep of jets3t to 0.7.1 (to eliminate spurious warnings when checking for files)
Copy-paster from the original review:
(i) If we follow the way of customizing topic-to-table mapping, we should do it in a generic way. E.g., you could introduce a param called secor.topic.hive.mapping and let it take a list of topic-table names,
(ii) move the comment to the top level properties file next to a related property with empty value.