Add DHCP support to the QuantumManager and break apart dhcp/gateway

This introduces a new flag "quantum_use_dhcp=<boolean>" which indicates whether
or not to enable dhcp for all of the networks.  If it is set then we start
dnsmasq (and provide it with the IP/MACs from Melange) similar to how this was
done in linux_net before.

Prior to this if you enabled dhcp then you would also get a gateway device..
some people may not want that so we now require that you specify the gateway
when creating the network in order to end up with a device that will act as a
gateway.  If you're using Melange IPAM and you don't specify the gateway you
still end up with one because it doesn't allow you to not have one.  This lays
the groundwork for the option of not having one in the future, at least :)

Also, fix quantum/melange ipam interaction

We now query for the subnets by net_id/vif_id instead of searching through all
the blocks to find the right one.  Both of the allocate and deallocate for
instance calls are now using the vif_id -> network_id mapping instead of
searching the quantum networks.  get_port_by_attachment was also changed to
take a net_id so that we don't have to search through all of the quantum
networks to find the corresponding port.

Change-Id: I6a84da35237b6c5f5cdee91ada92642103439a97

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