Allow zero vlans in network_vlan_ranges

In configurations which use flat network types, the templates
must still include the provider interface name in network_vlan_ranges
in order for quantum-server to recognize the device, regardless of
whether or not a VLAN is being used.
Merge pull request #48 from DavidWittman/quantum-flat-network-fix

Allow zero vlans in network_vlan_ranges
Add Quantum Endpoint SSL Support