Move the InnoDB Plugin tests from storage/innodb_plugin/mysql-test/ where

they are ignored to a new test suite "innodb_plugin".

Remove a hack in mtr that was deployed to run the builtin InnoDB tests against
the InnoDB Plugin. Also detect if a test is an 'innodb plugin test' and if so
then transparently replace the builtin InnoDB with the InnoDB Plugin.

mysql-test/suite/innodb_plugin/t/innodb_bug44369.test

@@ -0,0 +1,17 @@
+# This is the test for bug 44369. We should
+# block table creation with columns match
+# some innodb internal reserved key words,
+# both case sensitively and insensitely.
+
+--source include/have_innodb.inc
+
+# This create table operation should fail.
+--error ER_WRONG_COLUMN_NAME
+create table bug44369 (DB_ROW_ID int) engine=innodb;
+
+# This create should fail as well
+--error ER_WRONG_COLUMN_NAME
+create table bug44369 (db_row_id int) engine=innodb;
+
+--error ER_WRONG_COLUMN_NAME
+create table bug44369 (db_TRX_Id int) engine=innodb;