Automatic merge from submit-queue

Update Docker version after cockpit installation

Fixes https://github.com/kubernetes/kubernetes/issues/24530
The vagrant setup didn't worked for me because `cockpit cockpit-kubernetes` brings their own Docker version (1.7) which doesn't work and the master components doesn't come up. More information about this bug are in my [issue](https://github.com/kubernetes/kubernetes/issues/24530).

My test system:

```bash
$ uname -a                        
Darwin MyMacBook.local 15.4.0 Darwin Kernel Version 15.4.0: Fri Feb 26 22:08:05 PST 2016; root:xnu-3248.40.184~3/RELEASE_X86_64 x86_64

$ vagrant --version                                                                                                                                                             
Vagrant 1.8.1

$ VBoxManage --version                                                                                                                                                          
5.0.16r105871
```