Fixed permission on `keystone-manage.log` in keystone.upgrade.pre state

  It needed because `keystone-manage doctor` is ran under keystone user.

Change-Id: I610d1b35af69a68dc73695450a384ad3df70c7fe
Related-PROD: PROD-30473
(cherry picked from commit 3b163781d9d7afce429bb1ae46f8a6c3517e420f)
1 file changed