SE-1186 Enhances the analytics_single.yml playbook

Modifies the `analytics_single.yml` playbook to be able to use it to set up single-VM production analytics servers.

*JIRA tickets*: OSPR

*Sandbox URL*: TBD - sandbox is being provisioned.

*Merge deadline*: "None"

*Testing instructions*:

TBD

*Reviewers*

• [ ] @gr4scale

• [ ] edX reviewer[s] TBD

Configuration Pull Request
—

Make sure that the following steps are done before merging:

• [ ] A DevOps team member has approved the PR if it is code shared across multiple services and you don't own all of the services.

• [x] Are you adding any new default values that need to be overridden when this change goes live? No

• [ ] If you are making a complicated change, have you performed the proper testing specified on the [Ops Ansible Testing Checklist](https://openedx.atlassian.net/wiki/display/EdxOps/Ops+Ansible+Testing+Checklist)? Adding a new variable does not require the full list (although testing on a sandbox is a great idea to ensure it links with your downstream code changes).

• [ ] Think about how this change will affect Open edX operators. Have you updated the wiki page for the next Open edX release?