pylint: fix not-context-manager false positives
threading.Lock() in ipa-replica-conncheck is an alias to
thread.allocate_lock() which creates a LockType object.
This object is an actual context manager but the alias
seems to confuse pylint a bit.
https://pagure.io/freeipa/issue/6874
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>