Fix difference between mysql & psql of flavor-show

If you create a new flavor using a deleted flavorid,
the result of flavor-show is different between mysql and psql.

This issue is caused by the different processing for index in each db.

We need to specify the sort-type to avoid the issue.

Change-Id: Ib1029e80c1b981e1ec86d954b63f83650c9b1cc1
Closes-Bug: #1288636
(cherry picked from commit 4bbb4d88595cfd5f75528d8789be94d0ec9fbe62)
Merge "Fix difference between mysql & psql of flavor-show" into stable/havana