Merge pull request moby#303 from icecrime/cherry-picks-1.7.0

Cherry picks 1.7.0

Merge pull request moby#178 from mavenugo/master

Porting moby/moby#12437

Merge pull request moby#116 from mavenugo/master

Incorrect assumption with golang net package causes Overlapping IP

Merge pull request moby#37 from aboch/update

Sync libnetwork code to latest docker/master