Add a second origin server to CDN in a Box

[zrhoffman]

What does this PR (Pull Request) do?

This PR

• is not related to any Issue
• Renames the CDN in a Box origin server to origin-01
• Adds an origin-02 server to CDN in a Box
• Enables the multi-site origin feature for CDN in a Box's demo1 delivery service (was meant to be done in Topologies support for assigning ORG servers to Delivery Services #5164)
• Fixes a bug where the Traffic Ops server objects for CiaB's origin server did not include an IPv6 address because the BusyBox implementation of the route command that Alpine uses by default does not include the -6 flag. Fixed by installing the actual route command.

Which Traffic Control components are affected by this PR?

• CDN in a Box
• Documentation
• Traffic Ops (v1 API tests)
• CI tests

What is the best way to verify this PR?

• Run CDN in a Box, make sure the readiness container exits successfully
• Build the documentation
• Check the result of the CDN-in-a-Box CI workflow

If this is a bug fix, what versions of Traffic Control are affected?

For the origin route command fix:

• master
• 5.0.0 (RC5)
• 4.1.1

The following criteria are ALL met by this PR

• This PR includes tests
• This PR includes documentation
• This PR includes an update to CHANGELOG.md
• This PR includes any and all required license headers
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[ocket8888]

CDN-in-a-Box is getting pretty large... I, personally, think it ought to be kept to the absolute, simplest minimum to get a working CDN running. That was the original intention. It does support loading (somewhat) arbitrary data sets for testing purposes, but honestly I think it's high time we revisited the idea of splitting it into two. One setup for dev/demo and another for testing that can be more expansive. As a developer, I want CiaB to spin up fast and use the smallest amount of resources possible. Every new service we add impacts those two desires to some degree.

[zrhoffman]

The origin servers run on a 26.1MB Alpine-based image. I can understand wanting to avoid adding big, bulky things to CDN in a Box, but that's not what this.

Also, servers queue for enrollment in parallel, so the additional startup time added by this PR is the time that a single POST request takes, a fraction of a second.

[zrhoffman]

Having a second origin server in CiaB is not so important to me. PRed the bugfixes that this PR included in #5388, and closing this one.