Return appropriate errors when auth fails, not just 5xx

[thomshutt]

What does this pull request do? Explain your changes. (required) Have the Broadcaster return appropriate HTTP status codes on auth failure paths, to make monitoring and diagnosis of issues easier.

Specific updates (required)

• Bring in a new version of LPMS that includes an error return value in the auth method
• Handle this value and convert to HTTP statuses where appropriate

How did you test each of these updates (required)

• Ran unit tests

Does this pull request close any open issues?

• No

Checklist:

• [x] Read the contribution guide
• [x] make runs successfully
• [x] All tests in ./test.sh pass
• [x] README and other documentation updated
• [ ] Pending changelog updated

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.46154% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 57.40929%. Comparing base (6cfaf1e) to head (44f6b9e).

Additional details and impacted files

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