Add end-to-end tests to verify index limits when migrating from MySQL (#1238)

* Add end-to-end tests to check that index limits are adhered to when migrating from MySQL

* Add test cases to check limit on number of indices in a table

* Add test cases to check limits for length of index name

* Add test cases to check limits for number of columns in index

* Add test cases to check limits for size of index

Author: nmemond