mkdir -p

It fixes an error which occurs during building a Go Dockerfile

```                                                                                                                  
Step 8 : run /var/lib/tsuru/base/setup                                                                                                 
 ---> Running in 9a39cf676a96                                                                                                          
mkdir: cannot create directory `/home/application': File exists                  
```
Merge pull request #1 from crackcomm/patch-1

mkdir -p