Adding utility methods and conf for CPU limit MOM integration

Adding a MOM policy to monitor CPU tuning parameter.
Adding methods to vm.py to gather cpu tune information from the vm

Change-Id: Ic502d9a4a976cd76bb6042bbb51f6cd281199631
Signed-off-by: Kobi Ianko <kianku@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/27258
Reviewed-by: Francesco Romani <fromani@redhat.com>
Tested-by: Martin Sivák <msivak@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>