Provide a way to cleanup files when opening RocksDb as Secondary

[greymistcube]

As currently implemented, whenever a RocksDb instance is opened as Secondary, this leaves a new log file inside a randomly generated directory. This should be dealt with somehow. 😐

There are few things to consider:

• Would it be okay to remove artifacts associated with a RocksDb instance immediately after its disposal? In this case, we would lose access to the log file.
• On the other hand, if we don't remove any artifacts, depending on how often RocksDb would be opened as Secondary, the root directory structure along with its size may grow uncontrollably.
• One approach would be to systematically clean the folder from the application side.