This fixes the uninstall/reinstall oauth-toolkit shenanigans

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

Companion PR: https://github.com/edx/edx-analytics-pipeline/pull/204

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

up-to-date before running vagrant-analytics.yml playbook.

for analyticstack.

The dogwood devstack was not compatible with some changes made after dogwood was cut.

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.

First we update ansible then we run the playbook for the devstack.

ECOM-2184

edX can only support the latest Open edX release, which is Cypress as of
this commit. This commit clears out all the cruft from old Open edX releases
that edX cannot support anyway.