Anhvo/pps imds

[anhvoms]

Proposed Commit Message

Azure: Support pre-provisioning for images without UDF support

Without UDF support, DS Azure cannot mount the provisioning ISO,
which contains platform metadata necessary to support
pre-provisioning. The required metadata is made available in IMDS 
starting with api version 2021-08-01. This change will leverage IMDS
to obtain the required metadata to support pre-preprovisioning if 
provisioning ISO was not available.

Checklist:

• My code follows the process laid out in the documentation
• I have updated or added any unit tests accordingly
• I have updated or added any documentation accordingly

[TheRealFalcon]

Thanks!