Changed mysql-test to print warnings for not existing table to DROP TABLE

Cleaned up test; Removed wrong DROP TABLE commands and use standard table and database names.
changed store_warning() -> push_warning_print()

mysql-test/t/auto_increment.test

@@ -1,8 +1,10 @@
 #
 # Test of auto_increment;  The test for BDB tables is in bdb.test
 #
-
+--disable_warnings
 drop table if exists t1;
+--enable_warnings
+
 create table t1 (a int not null auto_increment,b int, primary key (a)) type=myisam auto_increment=3;
 insert into t1 values (1,1),(NULL,3),(NULL,4);
 delete from t1 where a=4;