[scn] fix failure of mittest after refresh feature scn

tools/deploy/mysql_test/include/wait_minor_merge.inc

@@ -0,0 +1,30 @@
+# set __table_id__ outside
+
+--disable_query_log
+--disable_result_log
+
+connect (obsys_minor,$OBMYSQL_MS0,admin,$OBMYSQL_PWD,test,$OBMYSQL_PORT);
+connection obsys_minor;
+
+
+let $__i__=180;
+while($__i__ > 0)
+{
+  sleep 1;
+  dec $__i__;
+  let $__memstore_cnt__ = query_get_value(select count(*) as cnt from oceanbase.__all_virtual_memstore_info where is_active='NO', cnt, 1);
+  if ($__memstore_cnt__ == 0)
+  {
+    let $__i__ = -5;
+  }
+}
+
+if ($__i__ != -5)
+{
+  --echo minor freeze failed
+}
+disconnect obsys_minor;
+connection default;
+
+--enable_query_log
+--enable_result_log