[SSSD] [sssd PR#947][comment] tests: fix race conditions in integration tests

[alexey-tikhonov]

URL: https://github.com/SSSD/sssd/pull/947
Title: #947: tests: fix race conditions in integration tests

alexey-tikhonov commented:
"""
Probably, those changes need better justification taking into account [3463](https://pagure.io/SSSD/sssd/issue/3463) and #345...
"""

See the full comment at https://github.com/SSSD/sssd/pull/947#issuecomment-558612320