The command 'stestr-3' is missed after upgrade in https://gitee.com/src-openeuler/python-stestr/pulls/12 This adds the lns back. (cherry picked from commit 52aa2cb0c36614975f0857166692be2fd490f01c)
(cherry picked from commit e18db18bf51e7101d8e411dbb515973c60d19923)