netinfo_tests: load bonding module for Centos7

In Centos7 bonding module is not automatically loaded
Added decorator to testGetBondingOptions to load bonding module
in case it is not loaded

Change-Id: I2daa43686eca3a0356e14786cc2939cca649b9ce
Signed-off-by: Genadi Chereshnya <gcheresh@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30882
Reviewed-by: Antoni Segura Puimedon <asegurap@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>