feat(versions): pull version number from fxa-auth-db-mysql server

[jamonation]

Reopening this after #908 went stale a while back, please check that PR for context.

When run against my local fxa-auth-server in docker I get the following:

curl http://127.0.0.1:9000
{
  "version": "1.47.0",
  "commit": "c29a7c3e4bd6ff5e925c9820b7033d1c99ef5424",
  "dbVersion": "0.45.0",
  "source": "git@github.com:jamonation/fxa-auth-server.git"
}

[vladikoff]

@jrgm to check this...

[vladikoff]

@jrgm there is a 10 sec timeout here, so we can give it a try? (maybe with a shorter timeout) to see how well it works in stage and prod

[jamonation]

Just a note regarding timeouts from the previous issue:

"I've set timeout to 10000ms in request.get. However, the request docs indicate that in the event of a TCP connection failing, the underlying OS timeout will take precedence. There doesn't appear to be a way to override. Thus, the caveat that the only time the 10s will be useful is if the remote db server is slow to respond, but is listening."

[vladikoff]

Thanks again for this PR! We are gonna close this for now and get back to it later, currently there are a few concerns about fetching the remove DB version from the auth server. We will try to revisit this in the future.