Fix error handling for authentication and no longer use session for retries #141
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_generate_token() only caught CommError's if they happened while trying Basic Authentication. Now it will catch them while trying Digest Authentication.
Clear auth token for any LoginError.
_command() was using a Session() for retry attempts. Don't do this anymore to make it more likely for retry to succeed. Also, for some as of yet unexplained reason using request.get() instead of session.get() seems to prevent intermittent snapshot failures.