Allow analytics_api and insights to be disabled on sandbox servers

Cleaning up /edx/etc/app (vs /edx/etc/app.yml)

This dates from when edxapp had yaml files that were created but never
used.

Use of it removed in 8f16fd28

Signed-off-by: Tomasz Gargas <tomasz@opencraft.com>

Before we would get /edx/etc/app and /edx/etc/app.yml
and it doesn't seem worth moving those around.

It refers to above but nothing happens above.

fixed json decoding

New base image with xqueue.yml and no json files for it

Bump jenkins heap size to 16 gb

Fix analytics-api name in new relic

Bump awscli from 1.15.10 to 1.15.19

This will dump all contents of GIT_REPOS

our use of edx_service expects XQUEUE_VERSION

Switch this over now that xqueue's change has landed

Remove xqueue special migration checks

Bumps [awscli](http://aws.amazon.com/cli/) from 1.15.10 to 1.15.19.

Signed-off-by: dependabot[bot] <support@dependabot.com>

OPS-3112

add newrelic infrastructure to notes

Easier to read with ?w=1 since 80% of this is delete and unindent

The role name changed to analytics_api for consistency but this fixes the newrelic
name back to analytics-api as monitoring is already set up against this name

Pass XQUEUE_CFG to several commands

We can also define DJANGO_SETTINGS and remove the --settings line to get
closer to edx_django_service, but not here.

Creating users and the supervisor jobs also need the environment
variable.

DEVOPS-7396

We were still passing xqueue_version from jenkins, so your branch
override wasn't seen.

Switch over to the newer config style for pre_supervisor

Move XQueue to use edx_service

These will also be skipped in the yaml file unless set which better
enables app defaults in XQueue

Make sure your config file is an environment variables.
Remove several hardcoded settings files from the devstack commands.

This means that your default in app/settings/base.py will retain the
default if there's no default set here.  Otherwise it would be set to
None instead.

OPS-2714

The main driving force is going from xqueue.(auth|env).json to
/edx/etc/xqueue.yml like other IDAs

There's a few additional cleanups such as normalization of the repo
configuration

Fix credentials fallback language code