[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:
"""
Btw, I still think it makes sense to have `INTERACTIVE_TIMEOUT > ENUMERATION_TIMEOUT + delay`. Even if currently CI runs fine with (equal timeouts & `/2`->`/1`)
"""

See the full comment at https://github.com/SSSD/sssd/pull/947#issuecomment-560440747