Katello-deploy updated centos 7 vagrant box

We Identified an issue with the Centos7 vagrant box that we were using
within Katello deploy that was preventing successful installations for
new users. To fix this we have pointed to a new box that is running
Centos 7.1 and is using a new box name. The next time you pull the
latest katello-deploy and vagrant up a centos7 box it will download the
new centos 7.1 image automatically and use that from now on.