Use random_password() in identity tests

instead of random_name() which may not be compliant with the keystone's
security_compliance settings.

Change-Id: If220cadfccec93ac4caaed0cf7ad37bd36f49ea8
Related-Issue: PROD-30608
(cherry picked from commit 33aaded9194aa2e9aeee047d80303ff59cfdec87)
2 files changed