#### What does this PR do?
Adds TO Go panic logging. If an endpoint handler panics, it was previously
unhandled. By default in Go, this meant the handler paniced, and a message like
"panic: index out of range" was printed, with no stacktrace or other file,
line, or function information.
This changes `traffic_ops_golang` to catch panics, and log panic message and
the stacktrace.
Note I am creating this PR in response to a real panic bug in the app. We've
observed a panic message in our logs, which is nigh-impossible to track down
without the stacktrace.
#### Which TC components are affected by this PR?
- [ ] Documentation
- [ ] Grove
- [ ] Traffic Analytics
- [ ] Traffic Monitor
- [x] Traffic Ops
- [ ] Traffic Ops ORT
- [ ] Traffic Portal
- [ ] Traffic Router
- [ ] Traffic Stats
- [ ] Traffic Vault
- [ ] Other _________
#### What is the best way to verify this PR?
Request any standard /api endpoint, to verify it works with the new wrapper.
We don't actually have a designed panic in the code, if you feel the need to
verify the stacktrace is logged, you will have to force a panic by modifying
the code, e.g. adding `forcePanic := []int{}; thisPanics := forcePanic[1]` to a
handler.
#### Check all that apply
- [ ] This PR includes tests
- [ ] This PR includes documentation updates
- [ ] This PR includes an update to CHANGELOG.md
- [ ] This PR includes all required license headers
- [ ] This PR includes a database migration (ensure that migration sequence is
correct)
- [ ] This PR fixes a serious security flaw. Read more:
[www.apache.org/security](http://www.apache.org/security/)
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[ Full content available at: https://github.com/apache/trafficcontrol/pull/2808
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