[SSSD] [sssd PR#360][synchronized] TESTS: Relax the assert in test_idle_timeout

[jhrozek]

   URL: https://github.com/SSSD/sssd/pull/360
Author: jhrozek
 Title: #360: TESTS: Relax the assert in test_idle_timeout
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/360/head:pr360
git checkout pr360