fix:add test for comment/ttl

tests/script/tsim/stable/alter_comment.sim

@@ -159,7 +159,7 @@ sql alter table db.stb rename tag t1 tx
 
 print ========== alter common
 sql alter table db.stb comment 'abcde' ;
-sql alter table db.stb ttl 10 ;
+sql_error alter table db.stb ttl 10 ;
 
 sql show db.stables;
 if $data[0][6] != abcde then

tests/system-test/fulltest.sh

@@ -98,6 +98,7 @@ python3 ./test.py -f 2-query/stateduration.py
 python3 ./test.py -f 2-query/function_stateduration.py
 python3 ./test.py -f 2-query/statecount.py
 python3 ./test.py -f 2-query/tail.py
+python3 ./test.py -f 2-query/ttl_comment.py
 
 python3 ./test.py -f 6-cluster/5dnode1mnode.py 
 python3 ./test.py -f 6-cluster/5dnode2mnode.py