remove pindata in docker for mac

[Andy Moncsek]

"pindata" was removed from Docker beta 16 for Mac. According to https://news.ycombinator.com/item?id=11567442 localhost should be used by default

[Vy-Shane Xie]

@danisla do you know what needs to be done to support Docker 1.12 beta for Mac?

[Dan Isla]

@vyshane yes I've been working on this and found a new way around the net=host issue, PR is on the way.