Allow the tenant id to be passed rather than common

[paktek123]

Running into the issue where I cannot authenticate to the common tenant and need to authenticate against a particular tenant id. Is it possible for the oauth2 url below to be constructed with a tenant id and default to common?

azure-data-lake-store-java/src/main/java/com/microsoft/azure/datalake/store/oauth2/AzureADAuthenticator.java

Line 104 in 47d3eaa

String authEndpoint = "https://login.microsoftonline.com/Common/oauth2/token";