Resolve "Missing module for MetadataDB"
This MR adds a GKFS_METADATA_MOD that can be used in a similar manner to GKFS_DATA_MOD. It also adds a "MetadataModule" logger that can be used to emit messages from the internal code of MetadataDB. This logger replaces the "MetadataDB" logger that was being instantiated in daemon.cpp but not used.
Closes #161 (closed)
Edited by Alberto Miranda