tests : setupNetworks resizeBond, remove param validation.

Added a couple of tests:

* testSetupNetworksResizeBond (functional test).
* testValidateNetSetupRemoveParamValidation (unit test).

Adding further coverage of setupNetworks and functions
on which it depends.

Change-Id: I6471a50152314e53e86e9f8e2e1359059fff17f0
Signed-off-by: Giuseppe Vallarelli <gvallare@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/17922
Reviewed-by: Dan Kenigsberg <danken@redhat.com>