Resolve "Missing module for MetadataDB"

Merged Alberto Miranda requested to merge 161-missing-module-for-metadatadb into master

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

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