adding datadog tag to sandboxes
updating base ami, including ora
Merge pull request #959 from edx/jarv/update-ami

updating base ami, including ora
squashing commits

devstack to not use pre_supervisor

typo error

Taking out edxapp_pypi_local_mirror, replacing with COMMON_PYPI_MIRROR_URL

Adding back - for white space

Conflicts:
	playbooks/roles/edxapp/tasks/deploy.yml
taking out paver task for now
Merge pull request #971 from edx/han/devpi

Using PyPi URL instead of DevPi
Make devpi optional for edxapp

To enable, set the `edxapp_devpi_enabled` variable to `true` and set
edxapp_pypi_local_mirror to point to wherever devpi is installed.
Remove XML modulestore from LMS
Add devpi_host setting to devpi role

Allow specifying a different host than localhost.
Fix forum LISTEN_{HOST,PORT} env variable names
Add flag to disable/enable New Relic

Set to 'false' to disable.