generalization of mtr to support suite.pm extensions:

* no automatic --loose-skip-innodb added by mtr based on the test name.
  instead loose-skip-innodb is now in the default_mysqld.cnf
* have_innodb_plugin.inc is changed to give a verbose "skip" message
  (instead of "require: true")
* My::Suite class. It's support in mtr, and everywhere
* support for suite.pm
* when sorting tests, take combinations into account
* support for SUITENAME_COMBINATIONS
* no special treatment for innodb_plugin in mtr_cases.pm
* two special pre-created config groups: ENV and OPT
* allow option names to start from #
* allow magic option to have an argument
* remove dead code
* fix @-substitution to works as expected
* new processes take the value of $opt_verbose automatically, no need to pass it to a constructor
* innodb_plugin suite uses suite.pm and combinations file to test as much as possible
  (innodb plugin, xtradb plugin, xtradb static - whatever available)
* besides test-master.opt and test-slave.opt a test.opt file is also
  loaded, both for master and slave
* .opt files for all included files are loaded too
* progress report in the xterm titlebar

mysql-test/suite/rpl/t/rpl_trigger.test

@@ -4,6 +4,11 @@
 # TODO: Remove statement include once 12574 is patched
 --source include/have_binlog_format_mixed_or_statement.inc 
 --source include/master-slave.inc
+--source include/have_innodb.inc
+connection slave;
+--source include/have_innodb.inc
+connection master;
+
 
 CALL mtr.add_suppression("Statement may not be safe to log in statement format.");
 
@@ -506,11 +511,9 @@ sync_slave_with_master;
 
 connection master;
 source include/master-slave-reset.inc;
-source include/have_innodb.inc;
 connection slave;
-source include/have_innodb.inc;
-
 connection master;
+
 create table t1 ( f int ) engine = innodb;
 create table log ( r int ) engine = myisam; 
 create trigger tr