branches/5.1: Merge a change from MySQL AB:

ChangeSet@2007-11-27 09:25:45+01:00, istruewing@stella.local 
Bug#32754 - InnoDB tests do not prepare or clean up correctly
    
Some test cases were missing preparation to deal with failed
predecessor test cases.
    	  
Added preparation (drop table if exists) to some test cases.

innodb-semi-consistent.test: Added preparation (drop table if exists).

mysql-test/innodb-semi-consistent.result

+drop table if exists t1;
 set session transaction isolation level read committed;
 create table t1(a int not null) engine=innodb DEFAULT CHARSET=latin1;
 insert into t1 values (1),(2),(3),(4),(5),(6),(7);

mysql-test/innodb-semi-consistent.test

 -- source include/not_embedded.inc
 -- source include/have_innodb.inc
 
+--disable_warnings
+drop table if exists t1;
+--enable_warnings
+
 # basic tests of semi-consistent reads
 
 connect (a,localhost,root,,);