TESTS: Add a test for parallel execution of klist Integration test for: https://pagure.io/SSSD/sssd/issue/3372 With https://pagure.io/SSSD/sssd/issue/3372 still broken, the unit test wold fail because one of the concurrent klist commands would trigger a race condition in the KCM queue code, crashing the KCM responder. Reviewed-by: Pavel Březina <pbrezina@redhat.com>

TESTS: Add integration tests for the KCM responder Reviewed-by: Michal Židek <mzidek@redhat.com> Reviewed-by: Simo Sorce <simo@redhat.com> Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>