Make ORT sort regex_revalidate.config by Time then URL

[rob05c]

The regex_revalidate.config looks like http://url unix-timestamp, and it's sorted alphabetically, which ends up being a pain to try to find things in.

It should be changed to sort by the time, and then by URL. That will be drastically easier for operators to work with.

I'm submitting a ...

• improvement request (usability, performance, tech debt, etc.)

Traffic Control components affected ...

• Traffic Ops ORT

Current behavior:

ORT config gen (atstccfg/atscfg) sorts regex_revalidate alphabetically.

Expected / new behavior:

ORT config gen (atstccfg/atscfg) sorts regex_revalidate by timestamp, then alphabetically.

Minimal reproduction of the problem with instructions:

Generate config. Observe sorted by URL, not timestamp.

Anything else:

[rob05c]

Assigning to myself, but it's not a huge priority for me. If anyone else wants to take it on before I get to it, feel free.