Generalized multi bosh lite

This allows us to parameterize the bosh lite environment networks. We can create networks with 

N = IP_ADDRESS_SUFFIX = 2..9

yielding:

10.(240 + N).0.0

We chose + N because of the bosh vagrant vm's default public ip:  192.168.50.4

In bosh configs, we are able to use 'N' to replace the 4:  192.168.50.N

So IP_ADDRESS_SUFFIX=4 yields the default networks 192.168.50.4 & 10.244.0.0/19

See: https://github.com/cf-buildpacks/bosh-lite-2nd-instance/commit/2bedc3e1e8a055d2b224c2462c017230d70c7068