2018-02-27 Version 0.4.22

Bugfix

• Remove a possible infinite loop with MSIAuthentication #77

Disclaimer

From this version, MSIAuthentication will fail instantly if you try to get MSI token
from a VM where the extension is not installed, or not yet ready.
You need to do your own retry mechanism if you think the extension is provisioning and
the call might succeed later.
This behavior is consistent with other Azure SDK implementation of MSI scenarios.