net-mgmt/py-msrestazure: update to 0.5.0

• Add LICENSE_FILE
• py-keyring: remove unused dependecency (per setup.py)
• Switch to using GitHub (i.e. caconical source)
• Take over maintainership
• ChangeLog:
  • Features:
    • Implementation is now using ADAL and not request-oauthlib. This allows more AD scenarios (like federated)
    • Add additionalInfo parsing for CloudError
    • Implement new LRO options of Autorest
    • Improve MSI for VM token polling algorithm
    • Allow ADAL 0.5.0 to 2.0.0 excluded as valid ADAL dependency
    • MSIAuthentication now uses IMDS endpoint if available
    • MSIAuthentication can be used in any environment that defines MSI_ENDPOINT env variable
    • CloudError now includes the "innererror" attribute to match OData v4
    • Introduces ARMPolling implementation of Azure Resource Management LRO.
    • Improve MSIAuthentication to support User Assigned Identity
    • Add support for WebApp/Functions in MSIAuthentication classes
    • Add parse_resource_id(), resource_id(), validate_resource_id() to parse ARM ids
    • Retry strategy now reachs 24 seconds (instead of 12 seconds)
    • Add Managed Service Integrated (MSI) authentication
    • Add "timeout" to ServicePrincipalCredentials and UserPasswordCredentials
    • Threads created by AzureOperationPoller have now a name prefixed by "AzureOperationPoller" to help identify them
    • Add cloud definitions for public Azure, German Azure, China Azure and Azure Gov
    • Add get_cloud_from_metadata_endpoint to automatically create a Cloud object from an ARM endpoint
    • Add cloud_environment to all Credentials objects (except AdalAuthentication)
    • Add proxies parameters to ServicePrincipal and UserPassword credentials class
    • Add automatic Azure provider registration if needed
  • Breaking changes: These breaking changes applies to ServicePrincipalCredentials, UserPassCredentials, AADTokenCredentials
    • Remove "auth_uri" attribute and parameter. This was unused.
    • Remove "state" attribute. This was unused.
    • Remove "client" attribute. This was exposed by mistake and should have been internal. No replacement is possible.
    • Remove "token_uri" attribute and parameter. Use "cloud_environment" and "tenant" to impact the login url now.
    • Remove token caching based on "keyring". Token caching should be implemented using ADAL now. This implies: o Remove the "keyring" parameter o Remove the "clear_cached_token" method o Remove the "retrieve_session" method