boxcutter/ubuntu1604 needs recent Vagrant, so pin at least 1.8.7

Xenial doesn't have Python 2 that ansible needs, so use ansible-bootstrap.sh to get it, though that might be way more than we need.

Instead of making the change just for ansible-provision.sh make the
change for all ansible runs.  Most of them don't currently have this
problem right now but I think it makes sense to make them all consistent
and not have to worry about this problem in the future.

* fix the analyticstack box (#3369)

* revert change to vagrant version

(cherry picked from commit a8bd50f9)

This jenkins instance will perform following tasks:

* Set up authentication using Jenkins Unix Auth Realm
* Set up administrative user
* Load credentials from a JENKINS_ANALYTICS_CREDENTIALS variable
* Checkout seed job repository
* Launch seed job to populate Jenkins with analytics Jobs

cf. https://github.com/edx/configuration/pull/2753#discussion_r52667259

Nobody tests on it, and it's probably broken.

When developing on devstack, it's useful to have a way to share source
trees between the host and the guest OS. The src directory is for this
sharing, so that working trees can be accessed inside the guest OS.

ECOM-2184

- Added explicit values for variables that must be shared between ecommerce and edxapp
- Added ecommerce virtualenv bin directory to PATH for ecommerce user
- Using local Django settings (instead of production)
- Disabled static file compilation for devstack
- Allowing ecommerce version to be specified via environment variable

ECOM-2185

Allows deployment of the ecommerce worker, a Celery-based IDA for asynchronously handling ecommerce tasks. ECOM-2306.

Counterpart to the Vagrantfile for testing individual Ansible roles.