cloud-init add azure proxy agent

[rmhsawyer]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• [x] The toolchain has been rebuilt successfully (or no changes were made to it)
• [x] The toolchain/worker package manifests are up-to-date
• [x] Any updated packages successfully build (or no packages were changed)
• [x] Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• [x] Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• [x] All package sources are available
• [x] cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• [x] LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• [x] All source files have up-to-date hashes in the *.signatures.json files
• [x] sudo make go-tidy-all and sudo make go-test-coverage pass
• [x] Documentation has been updated to match any changes to the build system
• [x] Ready to merge

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Summary

What does the PR accomplish, why was it needed? Add support for azure proxy agent. Initial PR was reverted due to failure in ptest.

Azure Guest Proxy Agent is a new feature in Azure that offers a key exchange protocol to secure communication between guest and host using eBPF.

Add opt-in feature which enables the Azure Guest Proxy Agent when ovf-env.xml has ProvisionGuestProxyAgent=True. Report provisioning failures if ProvisionGuestProxyAgent is enabled but images do not have azure-proxy-agent installed or functional.

Change Log

• add patch files to support azure-proxy-agent
• remove the headers_cb, mock_report_dmesg_to_kvp, unit tests from previously patch file which causes failure, as they have nothing to do with azure-proxy-agent and not backported in current version of cloud-init

Does this affect the toolchain?

NO

Associated issues

• https://microsoft.visualstudio.com/OS/_workitems/edit/53509145

Test Methodology

• full build: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=634352&view=results
• Buddy build: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=635437&view=results
• Azure VM provisioning test