Mysql, fix some excludes to be able runn AR tests

Author: JesseChavez

test/rails/excludes/mysql2/ActiveRecord/Migration/NoForeignKeySupportTest.rb

@@ -1 +1 @@
-exclude :test_check_constraints_should_raise_not_implemented, 'test expects newer MySQL version' unless ActiveRecord::Base.connection.supports_check_constraints?
+exclude :test_check_constraints_should_raise_not_implemented, 'test expects newer MySQL version' unless ActiveRecord::Base.lease_connection.supports_check_constraints?

test/rails/excludes/mysql2/ActiveRecord/PreparedStatementStatusTest.rb

@@ -1 +1 @@
-exclude :test_prepared_statement_status_is_thread_and_instance_specific, 'test expects prepared_statements to be off for mysql' if ActiveRecord::Base.connection.prepared_statements
+exclude :test_prepared_statement_status_is_thread_and_instance_specific, 'test expects prepared_statements to be off for mysql' if ActiveRecord::Base.lease_connection.prepared_statements

test/rails/excludes/mysql2/EagerLoadingTooManyIdsTest.rb

@@ -1 +1 @@
-exclude :test_preloading_too_many_ids, "works only with PS, fails in plain AR with MRI too" unless ActiveRecord::Base.connection.prepared_statements
+exclude :test_preloading_too_many_ids, "works only with PS, fails in plain AR with MRI too" unless ActiveRecord::Base.lease_connection.prepared_statements

test/rails/excludes/mysql2/Mysql2ConnectionTest.rb

@@ -5,6 +5,6 @@
 exclude :test_mysql_connection_collation_is_configured, "Issue #884"
 exclude :test_wait_timeout_as_url, 'uses URL format unknown to JDBC driver (i.e. "mysql2:///")'
 
-if ActiveRecord::Base.connection.jdbc_connection(true).java_class.name.start_with?('org.mariadb.jdbc')
-  exclude :test_mysql_strict_mode_specified_default, 'MariaDB driver reports more options'
-end
+# if ActiveRecord::Base.connection.jdbc_connection(true).java_class.name.start_with?('org.mariadb.jdbc')
+#   exclude :test_mysql_strict_mode_specified_default, 'MariaDB driver reports more options'
+# end