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This adds termination support to the ec2 module

Add an empty default xserver env.

Bastion egress should be port 22 not 80.

Jbau/fix/xqueue underscore

it was not called for

Initial set of files to bring up a staging edx

The main thing of interest here is stage-ansible.cfg and
stage-ssh-config, which taken together offer a way to have an
environment with different access control policies and a different VPC
jumpbox without disturbing the usual case of working with your VPC
production hosts.

To run this, edit stage-ssh-config with a sensible jumpbox configuration
and make sure the options in stage-ansible.cfg are the set of ansible
options you expect to use, then invoke ansible with ANSIBLE_CONFIG like
so:
```
ANSIBLE_CONFIG=stage-ansible.cfg ansible-playbook -v -i './ec2.py' edxapp_stage.yml
```

Add lynx to packages for converting html to plaintext

use edxapp instead of individual gunicorn processes

Conflicts:
	playbooks/edx-west/edxapp_prod.yml

Feanil/ansible xserver

  - For multipart email