Remove master for el6 ovirt-node-iso job

Hey, on master (ovirt-3.6) will not be support oVirt Node iso on el6 anymore. Tolik, please disable the following jobs and remove their definition in the yaml files. http://jenkins.ovirt.org/user/fabiand/my-views/view/Node/job/ovirt-node_mast... http://jenkins.ovirt.org/user/fabiand/my-views/view/Node/job/ovirt-node_mast... Thanks fabian