tsim/sma/drop_sma: sleep 1s before creating db to avoid in dropping

tests/script/tsim/sma/drop_sma.sim

@@ -129,6 +129,7 @@ sql DROP INDEX sma_index_3 ;
 
 print ========== step8
 sql drop database if exists db;
+sleep 2000
 sql create database db duration 300;
 sql use db;
 sql create table stb1(ts timestamp, c_int int, c_bint bigint, c_sint smallint, c_tint tinyint,c_float float, c_double double, c_bool bool,c_binary binary(16), c_nchar nchar(32), c_ts timestamp,c_tint_un tinyint unsigned, c_sint_un smallint unsigned,c_int_un int unsigned, c_bint_un bigint unsigned) tags (t_int int);