[SSSD] [sssd PR#25][synchronized] TESTS: Add integration tests for the proxy provider of sssd-secrets

[fidencio]

   URL: https://github.com/SSSD/sssd/pull/25
Author: jhrozek
 Title: #25: TESTS: Add integration tests for the proxy provider of sssd-secrets
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/25/head:pr25
git checkout pr25