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-replace.test

@@ -0,0 +1,22 @@
+-- source include/have_innodb_plugin.inc
+# embedded server ignores 'delayed', so skip this
+-- source include/not_embedded.inc
+
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
+#
+# Bug #1078
+#
+create table t1 (c1 char(5) unique not null, c2 int, stamp timestamp) engine=innodb;
+select * from t1;
+--error ER_DELAYED_NOT_SUPPORTED
+replace delayed into t1 (c1, c2)  values ( "text1","11");
+select * from t1;
+--error ER_DELAYED_NOT_SUPPORTED
+replace delayed into t1 (c1, c2)  values ( "text1","12");
+select * from t1;
+drop table t1;
+
+# End of 4.1 tests