Revert "[3.0] dhcp/dhclient.conf: add option rfc3442-classless-static…

[sindhu-karri]

…-route in dhclient.conf (#8375)"

This reverts commit 98e3dcb.

Merge Checklist

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

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

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Summary

What does the PR accomplish, why was it needed?
The lisa testcase "validate_netvsc_reload" is failing due to dhcp changes in #8587
The testcase is passing once the above commit is reverted.

Test fails without fix: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=544973&view=logs&j=528a33a8-464e-565a-7855-df1244039b47
Test passes with fix: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=544809&view=logs&j=528a33a8-464e-565a-7855-df1244039b47

Note that the commit is already reverted in main (2.0) to fix the validate_netvsc_reload testcase.
#8587

Change Log

• Revert option for classless static route configuration in dhclient.conf

Does this affect the toolchain?

NO

Associated issues

• #xxxx

Links to CVEs

• https://nvd.nist.gov/vuln/detail/CVE-YYYY-XXXX

Test Methodology

• Buddy build: https://dev.azure.com/mariner-org/mariner/_build/results?buildId=543622&view=results