Removed the flag that disables innodb on slave in the default
configuration of replication tests. That made the explicit
--innodb flag in -slave.opt files redundant, so lots of -slave.opt
files could be removed. Also, -master.opt files containing reduntant
--innodb flag were removed (those were redundant even without
changing the default). Removing .opt files is good because .opt
files cause server restarts and make tests less readable.
Also fixed a bug where rpl_innodb_mixed_ddl unintentionally
used myisam on slave.


mysql-test/suite/rpl/r/rpl_innodb.result:
  updated result file
mysql-test/suite/rpl/r/rpl_innodb_mixed_ddl.result:
  updated result file. this is how the test is supposed to be, it was a bug
  that it used myisam on the slave.
mysql-test/suite/rpl/rpl_1slave_base.cnf:
  Removed flag to disable innodb on slave, and added explicit --loose-innodb
  flags on both master and slave.
mysql-test/suite/rpl/t/rpl_innodb.test:
  Ensure that the slave uses myisam (this was previously done
  by not adding the --innodb flag on slave).