Add Neutron network type and VLAN ranges to network-environment.yaml

Add Neutron network type and VLAN ranges to network-environment.yaml

The command-line options for Neutron network settings have been
deprecated in favor of setting parameter defaults in environment
files. This update includes the most common settings which were
previously set using CLI options in the sample
network-environment.yaml. This should also make it possible to
deploy in virtual environments without editing any files, since
the network-environment.yaml will include sane defaults.

Change-Id: Ieae59dfec287b9e5424a2e560de9f7b1bd598536