Portability fixes (mostly test suite)

Make ENGINE= an alias for TYPE= (Compabiltiy with 4.1)
Fix when using symlinked data files and realpath() is not working

mysql-test/t/rpl_trunc_binlog.test

@@ -21,4 +21,5 @@ start slave;
 # can't sync_with_master so we must sleep
 sleep 3;
 --replace_result $MASTER_MYPORT MASTER_PORT
+--replace_column 18 #
 show slave status;