Support head_dir
Feature description
The current ArakoonConfigObject do not take in a head_dir property. This can be set in the arakoon config though so we should support it
What does this bring or solve?
The healthcheck checks the size of the partition where the head.db will go. This will allow the healthcheck to extract this info from the Framework (The healthcheck extract all other information from the Framework, only head_dir is missing )
This might be missing some context: The reason for this ticket was https://github.com/openvstorage/openvstorage-health-check/issues/222. The collapse checking would have required the location of the head.db file (which is by default the tlog_dir unless a head_dir property is set)
The head_dir config might be removed in the meantime (if the move to RocksDB is finished https://github.com/openvstorage/arakoon/issues/128)