Marathon command tweaks

Summary:
* Update params to reflect Marathon 0.5.0
* Disable container restart-on-reboot (let runit handle this)
* Use host networking for container to give Marathon an addressable IP

Test Plan: Launch a stack

Reviewers: merkkila

Reviewed By: merkkila

Subscribers: tberman, justin, stephan, serdar

Differential Revision: http://phabricator.thefactory.com/D2384