Fix MaxRevalDurationDays validation for invalidation jobs

[rawlinp]

What does this PR (Pull Request) do?

Fix the validation of invalidation job TTLs per the maxRevalDurationsDays parameter. The broken validation was not converting days to hours before doing the validation. This PR also adds that validation to the /jobs endpoints because it was missing.

• This PR is not related to any Issue

Which Traffic Control components are affected by this PR?

• Traffic Ops

What is the best way to verify this PR?

Run the unit tests and TO API tests. Verify they pass. Manually POST /api/1.4/user/current/jobs with a ttl that higher than the value of the maxRevalDurationDays parameter (x 24). Example request json below:

{
  "startTime": "2020-05-26 16:48:32",
  "dsId": 442,
  "regex": "/foobar",
  "ttl": 3000
}

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

• master
• 4.0.0
• 4.1.0-RC0

The following criteria are ALL met by this PR

• This PR includes tests
• bugfix, no docs necessary
• This PR includes an update to CHANGELOG.md
• This PR includes any and all required license headers
• This PR ensures that database migration sequence is correct OR this PR does not include a database migration
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[zrhoffman]

Branch has a merge conflict in the changelog

[rawlinp]

Thanks! Merge conflict resolved.

[zrhoffman]

• API tests pass
• gofmt is happy with the added code
• Code looks good
  👍