Triage Crawler exceptions: geit getting 401

[brphelps]

exceptions | summarize Geit401 = countif(outerMessage contains "401 Authorization Required" and outerAssembly contains "geit")

[brphelps]

When triaging, make sure to identify whether this issue should or shouldn't be happening -- if it's not truly exceptional, try to convert to a less interesting tracing method (e.g. a warning trace).

[jeffmendoza]

For these, the message is "discoverFromGitHubTags (some github url)" and the url 404s (or is private?). It's correct for the crawler to try to crawl potential source urls. We need to just log this error and move on.

Looks like the code is here:
https://github.com/clearlydefined/crawler/blob/master/lib/sourceDiscovery.js#L97
https://github.com/clearlydefined/crawler/blob/master/lib/sourceDiscovery.js#L108