Configure the minikube ip

[alexef]

Is this a BUG REPORT or FEATURE REQUEST? (choose one):
This is a Feature Request.

Minikube version (use minikube version):
v0.17.1

Environment:

• OS (e.g. from /etc/os-release): Mac OS X 10.12.4
• VM Driver (e.g. cat ~/.minikube/machines/minikube/config.json | grep DriverName): xhyve
• ISO version (e.g. cat ~/.minikube/machines/minikube/config.json | grep -i ISO or minikube ssh cat /etc/VERSION): minikube-v1.0.7.iso
• Install tools: -
• Others: -

What happened:
We are using minikube as a developer machine for our web application.

According to the documentation, the IP is dynamic and can change. It can be retrieved with minikube ip.

What you expected to happen:
We would like to be able to configure this IP to a fixed value, so that we can assign a DNS name to the machine, and that name should be available across all developer machines.

How to reproduce it (as minimally and precisely as possible):
Starting/stopping minikube will some times assign a different ip.

[aaron-prindle]

Related: #951

[r2d4]

Closing as a dupe of #951, we'll track it there