netinfoTests: Do not try to read bonding options

A user running the tests usually does not have sudo permissions
to create a bond.

Change-Id: Id85764ac54a29a2359bb81ca1ce0819a0eee2758
Signed-off-by: Ondřej Svoboda <osvoboda@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/31270
Reviewed-by: Dan Kenigsberg <danken@redhat.com>