Expand Resiliency Error Codes

[kgidewall]

We currently invoke resiliency mode when the following conditions occur: network timeout or http error codes 500, 503, 504. After discussion, we have decided to expand the error code list to include ALL http error codes 500 - 599. Please change your logic to include all of those codes for Resiliency.

[rayluo]

Closing this due to 3 reasons:

• At this point, ADAL Python no longer receives any new changes except bugfixes.
• In the successor, the MSAL Python, we headed to a different direction anyway: errors and http errors could be retried in http layer (by a customized http client), and/or eventually being raised as exceptions.
• Recently, MSAL Python also implemented a resiliency feature which focuses on not overloading the AAD service.