Comment 0 for bug 1716489

(1) Refactor current Gluon code to fit into a Neutron Service Plugin
  * Refactor API generator
  * Refactor database to resue Neutron's database
(2) Two additional tasks that are also related to Neutron
  * optional "network" in Neutron, i.e. when creating a port, it doesn't need to attach to a network
    - https://bugs.launchpad.net/neutron/+bug/1664461
  * new "network type" attribute
    - https://bugs.launchpad.net/neutron/+bug/1664466
(3) Coding to experiment it
(4) Open questions:
  * Do we keep current "gluon" repo or create a new repo e.g. "networking-gluon"
    - Assume we go "networking-gluon" route for Gluon 2.x (Neutron Service Plugin), and keep "gluon" repo for Gluon 1.x (Extended ML2 Plugin).
  * Implement it as "Service Plugin" generator, or just a "Service Plugin"?
    - subject to initial experiment