prosody with mysql clarification

[Stephen Graf]

When I tried to set up prosody with sql storage using mysql I followed the
instructions in the package and added luadbi-mysql.  However prosody did not
seem to pick up on it even though the prosody documentation says that
nothing more is required.  When I looked into what luadbi-mysql provided I
discovered a c library, dbdmysql.so. How is this converted to a lua file
that prosody can use?