The devel branch of the haas provides no good automated way of tearing
down the network state created when applying a project. Here's how to
do it manually:

    brctl delif br-vlan${vlan_number} em3.${vlan_number}
    vconfig rem em3.${vlan_number}
    ifconfig br-vlan${vlan_number} down
    brctl delbr br-vlan${vlan_number}

We're using `em3` as an example; do a `brctl show` to find out what
the right nic actually is.

The script `create_dell_vlans` can be used to pre-populate the bridges
and vlan nics needed for the HaaS to operate, but right now we don't
have an automated way to delete them. You shouldn't need to do this to
use the HaaS, but if for some reason you want to delete the nics related
to a given vlan, you can do:

    brctl delif br-vlan${vlan_number} em3.${vlan_number}
    vconfig rem em3.${vlan_number}
    ifconfig br-vlan${vlan_number} down
    brctl delbr br-vlan${vlan_number}

We're using `em3` as an example; do a `brctl show` to find out what
the right nic actually is.

Update docs about deleting bridges/nics.
Update docs about deleting bridges/nics.

These have been out of date since we started pre-populating the nics.
