bond: improve the validation for setting peer_notif_delay
bond: improve the validation for setting peer_notif_delay

Synchronize with NM, the default value of peer_notif_delay in NM is 0,
which is not considered as enabling the setting or specifying the
delay.

Signed-off-by: Wen Liang <5ee3357fb455f67019b3676c8968488c41307286@gmail.com>

linux-system-roles/network,linux-system-roles/network,linux-system-roles/network