Change in vdsm[ovirt-3.5]: Balloon should not work when guest agent is not present

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Change subject: Balloon should not work when guest agent is not present
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Patch Set 1:

* Update tracker::#1232669::OK
* Check Bug-Url::OK
* Check Public Bug::#1232669::OK, public bug
* Check Product::#1232669::OK, Correct product Red Hat Enterprise Virtualization Manager
* Check TR::#1232669::OK, correct target release 3.5.4
* Check merged to previous::OK, change not open on any previous branch