Title: #4412: [Backport][ipa-4-7] ipatests: wait for SSSD to become online in
Manual backport of PR #4383 to ipa-4-7 branch.
There was a conflict on ipatests/pytest_ipa/integration/tasks.py because the file contains
a additional methods on the master branch, that are not needed in this PR.
To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/4412/head:pr4412
git checkout pr4412