Publish androidctl tool in a separate repo

We have this awesome androidctl tool written by lrossett@redhat.com.

It would be great to publish it in a separate repo to also make other people benefit from it.
Also, it is a bit big to live here: https://github.com/aerogear/digger-jenkins/tree/master/docker/android-sdk/tools/androidctl

After doing this, answer every question in StackOverflow that involves automation of Android SDK automation.

There is something different btw: after this change, we would need to change how we put the androidctl tool into the image. Currently we just copy stuff in the Dockerfile. In the new approach, we would need to issue a pip (or easy_install) command in the Dockerfile. I think this is ideal.