[Container-tools] Atomicapp Marathon Provider

[Dharmit Shah]

Hello all,

Me and Tomas have started working on Marathon [1] provider for atomicapp.
Intention is to be able to deploy the apps on Mesos using `atomicapp run`.

Below is our plan for a minimal POC:

- Use requests library to interact with the Marathon REST API.

- Use initial code [2] and test if standalone apps work fine.

- Going further, we intend to use `mesos-dns` as the service discovery tool
   within Mesos environment. End user can obviously choose a different tool.
   Only thing that has to change is the application code.

We would like to have feedback/suggestions from others regarding the plan.
I think, both me and Tomas are going to bug atomicapp devs quite often. ;)

[1] https://mesosphere.github.io/marathon/
[2] 
https://github.com/kadel/atomicapp/blob/marathon-provider/atomicapp/providers/marathon.py

Regards,

-- 
Dharmit Shah