ABFS: FS initialize fails for incompatible account-agnostic Token Provider setting

When AuthType and Auth token provider configs are set for both generic and account specific config, as below:

// account agnostic

fs.azure.account.auth.type=CUSTOM

fs.azure.account.oauth.provider.type=ClassExtendingCustomTokenProviderAdapter

// account specific

fs.azure.account.auth.type.account_name=OAuth

fs.azure.account.oauth.provider.type.account_name=ClassExtendingAccessTokenProvider

 For account_name, OAuth with provider as ClassExtendingAccessTokenProvider is expected to be in effect.

When the token provider class is being read from the config, account agnostic config setting is read first in the assumption that it can serve as default if account-specific config setting is absent. But this logic leads to failure when AuthType set for account specific and otherwise are different as the Interface implementing the token provider is different for various Auth Types. This leads to a Runtime exception when trying to create the oAuth access token provider.

This Jira is to track the fix for it.