networkTests: BOND_NAME constant changed to bond11

getVdsCaps on rhel6 reports bond0-4 as existing
regardless of their true existence (see
_report_legacy_bondings).

This confuses the testing changes in upcoming
patches, hence we prefer to test a bond name with
no legacy burdens.

Change-Id: Id9f1892eaeae68583a792cb122cad4a5162e68fa
Signed-off-by: Petr Horáček <phoracek@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/31332
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>