network: Fix valid bond name description

Previously the desription suggerated that only bond[0-9] was valid. This
patch updates the validator to allow any bond namebetween bond[0-9]{1,2}
and also updates the user facing description.

Change-Id: I62aae14292bcc82412f1d45bd64f85fd7c5be161
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1020662
Signed-off-by: Fabian Deutsch <fabiand@fedoraproject.org>