MSAL Python 1.17.0

[rayluo]

• New: Define some Cloud Instance constants and the usage pattern of using them (#221, #433)
• Enhancement: Lazy-load dependencies so that the start-up and run time will usually be faster. (#423, #454)
• Enhancement: Bubble up token refresh exceptions (#431, #434)
• Enhancement: Documents a simpler http_cache usage pattern (#439)
• Enhancement: Expose authority discovery error for troubleshooting (#443)
• Enhancement: Actionable exception message when local machine time error is detected (#446, #449, #453)
• Enhancement: Actionable exception message when username password flow encounters errors with ADFS (#456, #458)

You can install and test this release candidate by:

pip install git+https://github.com/AzureAD/microsoft-authentication-library-for-python.git@release-1.17.0