Remove un-used scripts.

playbooks/edx-east/provision_new_stack.yml

-# Create a cloudformation stack.
-- name: Create cloudformation stack for {{STACK_NAME}}
-  hosts: localhost
-  connection: local
-  gather_facts: False
-  roles:
-    - launch_cfn
-
-# Provision Users on everything.
-- name: Create Users
-  hosts: tag_aws_cloudformation_stack-name_{{STACK_NAME}}
-  roles:
-    - gh_users

util/jenkins/prepare_venv.sh

-if [ ! -d /mnt/virtualenvs/"$JOB_NAME" ]; then
-    mkdir -p /mnt/virtualenvs/"$JOB_NAME"
-    virtualenv --system-site-packages /mnt/virtualenvs/"$JOB_NAME"
-fi
-
-export PIP_DOWNLOAD_CACHE=/mnt/pip-cache
-
-. /mnt/virtualenvs/"$JOB_NAME"/bin/activate
-
-cd configuration
-pip install -r requirements.txt