Move modulestates to schema initialization

[karenc]

Module states should really be part of the database initialization, it's
not data to be added later. It is necessary for the application, so
moving it to cnxarchive/sql/schema/.

[karenc]

See also openstax/cnx-publishing#136

[coveralls]

Coverage decreased (-0.002%) to 94.479% when pulling e1bfd6b on move-modulestates-to-schema-initialization into 0990a75 on master.

[mmulich]

For the sake of consistency, could you put these in a file within the schema/constants directory?

For example, the schema/constants/roles.sql contains inserts for the roles table.

[karenc]

Oh I didn't realize we have a schema/constants directory... 😓
I've moved the file.

[coveralls]

Coverage decreased (-0.002%) to 94.479% when pulling 9c8559e on move-modulestates-to-schema-initialization into 0990a75 on master.

[coveralls]

Coverage decreased (-0.002%) to 94.479% when pulling 265770c on move-modulestates-to-schema-initialization into 0990a75 on master.