Migrate to odhcp6c for dhpcv6 client support #793

Job	Run time
check-trigger	4s
build-x86_64 / Build infix x86_64_minimal	31m 41s
build-aarch64 / Build infix aarch64_minimal	30m 12s
test-run-x86_64 / Regression Test infix x86_64_minimal	44m 42s
test-publish-x86_64	-1s
	1h 46m 38s

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