Upgrade mongo_mms and backup agent(OPS-3063)

Add config for the certificate agent queue polling frequency.

Remove unused VIRTUAL_UNIVERSITIES setting

Fix analytics_api role when analytics db name differs from config name

In https://github.com/edx/configuration/pull/4443/files I mistakenly changed
the ANALYTICS_DATABASE to the ANALYTICS_API_REPORTS_DB_NAME. In fact this
config refers to the database config identifer in the DATABASES dictionary.

This worked fine in sandboxes where both the config and the db are named
'reports', however when those configs differ, such as on staging, the health
check would fail as it tries to connect to the reporting database. This PR
fixes that change by setting this value back to 'reports'

Add dockerfiles for analytics pipeline

It looks like this was part of the original rollout of the microsites
feature back in December 2013, but was quickly removed in February
2014. These references have been orphaned ever since.
I can find no other references to it in the platform, save these.

The relevant platform code is pruned here:
https://github.com/edx/edx-platform/pull/18072

[jenkins_common] update the seed_job.xml

TE-2548 Support for building Open edX release Docker images

Add declarative pipeline plugin and alphabetize list

Fix analytics name when calling play

Among other things, this will:

* Fix the "assignedNode" tag to allow this job to run on instances
  labeled "dsl-seed-runner".  Otherwise, this job will not run at all.

* Correct indentation for multi-line text areas, including
  "additionalClasspath".  Otherwise this job is guaranteed to fail.

* Update some hard-coded plugin versions, apparently.

Also cleaned up roles to plays to better indicate what they map to

[jenkins_build] Add the pipeline-utility-steps plugin

Remove Vagrantfiles for Open edX installations

Was trying to keep the play consistant with the role, but there were downstream
consumers (gocd) where underscores were not used so consistency was impossible.
Opting to go back to the way the play was previously named

The primary motivation is that this provides convenience functions for
parsing YAML files.

Move analytics-api to edx_django_service role

set dns_name for all sandbox runs

Estute/install and configure splunk plugin

TE-2546 Remove references to obsolete requirements files

Bump boto3 from 1.7.4 to 1.7.6

Bumps [boto3](https://github.com/boto/boto3) from 1.7.4 to 1.7.6.
- [Release notes](https://github.com/boto/boto3/releases)
- [Changelog](https://github.com/boto/boto3/blob/develop/CHANGELOG.rst)
- [Commits](https://github.com/boto/boto3/compare/1.7.4...1.7.6)

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

Fix requirements for jenkins worker

revert splunk config work