Remove master for el6 ovirt-node-iso job

[Fabian Deutsch]

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_master_create-iso-el6_merged/
http://jenkins.ovirt.org/user/fabiand/my-views/view/Node/job/ovirt-node_master_create-rpms-el6_merged/

Thanks
fabian