Improve Intel SGX SDK Attestation Sample

[saiakhil2012]

Purpose

I was trying out the Intel SGX based SDK attestation sample, and had to do multiple changes to the steps which are currently mentioned for quote generation and quote validation. Creating this PR with changes I had to do in the steps to make it work, to help in easing the consumption of this sample by others in future.

Following is the summary of all the changes in this PR,

• Adding more packages which are required to be installed
  • Without these various related errors are observed at various steps
• Adding details about installing Azure DCAP
  • Otherwise PCCS is tried to be contacted instead of Azure THIM
• Add instruction about performing Azure login using Azure CLI which is required for the Quote verification step
• Changing the sample quote validation code
  • This change is as suggested by a related issue in azure-sdk-for-net (SharedTokenCacheCredential authentication fails in Azure.Identity on ubuntu Azure/azure-sdk-for-net#17052 (comment))
  • Without this change, quote validation step was not going through

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Documentation content changes
[ ] Other... Please describe:

How to Test

• Test the code

Follow the instructions in the Intel SGX SDK based Attestation Sample

Other Information

This was observed and tested on a Intel SGX based Azure VM with Ubuntu 20.04 as the Operating System

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[saiakhil2012]

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