This commit adds metadata column to the coverage table. This should be
useful to filter results in the future.
Change-Id: I224d340b70ddd2c3cf7923f517281020470a9e45
This commit adds 'files' table. This files table has coverage_id
column as a foreign key for the coverages table. And this commit also
adds a release note for it.
Change-Id: I8998a79a1ba79bbdab1cd79810cc85bcbccbe7d8
