Make magical auto assignment happen

[rtucker-mozilla]

Make a function to be able to figure out the vlan/ip address information from hostname and assign an available ip address

[uberj]

Notes for later
Given a hostname like 'foo.dmz.corp.phx1.mozilla.com' parse the name into the following objects.

...mozilla.com

In this case:

label = 'foo'
vlan = 'dmz'
site = 'phx1.corp'

With this info, do:

    phx1 = Site.objects.get(name='phx1')
    corp_phx1 = Site.objects.get(name='corp', parent=phx1)
    vlan = Vlan.objects.get(name='dmz')
    networks = vlan.network_set.filter(site=corp_phx1)
    for network in networks:
        for range in network.range_set.all():
            # If the range has a free ip, use it!