Move plugin choice and network type to hiera

kickstack was attempting to get both
quantum_network_type and quantum_plugin
from kickstack::params when they aren't
specified there and should be in hiera

This also makes introspection easier since
every other class parameter is a hiera lookup
network_type and plugin are specified in
kickstack::quantum::config and shouldn't
be mentioned in kickstack
Merge pull request #1 from michaeltchapman/quantum_config

Quantum config