Add ability to pipe already available scripts as the response.

[agentmilindu]

The problem

There are some tools which already have installer scripts, for example Docker has https://get.docker.com. There is no point we keeping these scripts on our repo as we have to keep them uptodate everytime the original one updated.

The proposed solution

It is better if we can fetch the script directly from the original one and server as the responce.

[harsha-iiiv]

You mean fetching script and put it in installer.sh file right? @agentmilindu