Change in vdsm[master]: periodic: add __str__ methods

gerrit-hooks has posted comments on this change.

Change subject: periodic: add __str__ methods
......................................................................

Patch Set 8:

* #1250839::Update tracker: OK
* Check Bug-Url::OK
* Check Public Bug::#1250839::OK, public bug
* Check Product::#1250839::OK, Correct classification oVirt
* Check TM::SKIP, not in a monitored branch (ovirt-3.6 ovirt-3.5 ovirt-3.4 ovirt-3.3 ovirt-3.2)
* Check merged to previous::IGNORE, Not in stable branch (['ovirt-3.6', 'ovirt-3.5', 'ovirt-3.4', 'ovirt-3.3'])