webadmin: Set miimon=100 for preset bonding options

So far it hasn't been set by default, which would apparently cause the
kernel to not poll for the status of the bonded NICs.

Change-Id: If4a6070639d6566f9ebb5e30adf16d63128eb820
Signed-off-by: Lior Vernia <lvernia@redhat.com>