Fixed schema migrations on MySQL where multiple schemas are under management by gomigrate.
Fixed schema migrations on MySQL where multiple schemas are under management by gomigrate.

The 'table exists' check for the migrations table wasn't qualified with the current
database, resulting in a false assumption that the migrations table exists in the current
database when in fact it is associated with a different database on the same server.  This
ultimately results in the migration failing for the current database with an error akin to
'migrations table not found'.

bryanpaluch/gomigrate,DavidHuie/gomigrate