Unnecessary modules within ActiveRecord namespace

[ebeigarts]

If project doesn't have mysql2 loaded it creates Mysql2Adapter as a module and causes issues

>> ActiveRecord::ConnectionAdapters::Mysql2Adapter
SchemaPlus::Views::ActiveRecord::ConnectionAdapters::Mysql2Adapter

In projects that have mysql2 it works correctly:

>> ActiveRecord::ConnectionAdapters::Mysql2Adapter
ActiveRecord::ConnectionAdapters::Mysql2Adapter < ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter

[ronen]

@ebeigarts Thanks for the report. Will try to look info it as soon as I can, but I'm pretty swamped right now. (PR's welcome!)