Commits on May 26, 2021

1. imdsclient: return options for all IMDS fetch functions …

   This commit changes the return type for the IMDS fetch functions to
   options returning None when a 404 is encountered. This makes it easier
   for the caller to decide what to do when a 404 occurs and is closer to
   the behavior before imdsclient was written.
   
   `fetch_identity_document` and its associated `IdentityDocument` struct
   were removed in favor of separate `fetch_region` and
   `fetch_instance_type` functions. Instance-type is now fetched via IMDS
   meta-data as opposed to the identity document. We are returning to the
   original behavior as it is possible that the identity document can be
   absent in certain situations.
   
   Changes were also made to shibaken, pluto, and early-boot-config to
   accommodate the options detailed above.

   

   jpculp committed May 26, 2021
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