Refetch subnet/network from DB in ML2 update ops

This ensures that any extensions run in the ML2 extension framework
that bump the revision number of the subnet or network result in the
altered revision number being returned to the API caller and passed
into the ML2 mech drivers and callback handlers.

Closes-Bug: #1627628
Change-Id: Ieb37a3833ee52c671419c6dc981cf91c2366ae94
1 file changed
tree: 32ef176550b97ee40f05b1be4300be686ba02862
  1. neutron/