Use case insensitive matching on lower_case_table_names=1,2

Use case insensitive matching on lower_case_table_names=1,2

Fixed regression caused by :ticket:`4344` released in 1.2.13, where the fix
for MySQL 8.0's case sensitivity problem with referenced column names when
reflecting foreign key referents is worked around using the
``information_schema.columns`` view.  The workaround was failing on OSX /
``lower_case_table_names=2`` which produces non-matching casing for the
``information_schema.columns`` vs. that of ``SHOW CREATE TABLE``, so in
case-insensitive SQL modes case-insensitive matching is now used.

Fixes: #4361
Change-Id: I748549bc4c27fad6394593f8ec93fc22bfd01f6c