cherry-picks from upstream on v1.15.8 for conformance test fix#21

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dhij wants to merge 4 commits intodhij/v1.15.8-conformancefrom dhij/v1.15.8-conformance-fix

+464-151

Commits on Sep 18, 2024

service: differentiate UDP and TCP protocols

authored and
dhij
committed
daemon, service: add bpf-lb-proto-diff flag

jibi
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dhij
committed
service: don't overwrite existing services with NONE protocol

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dhij
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service: use protocol ANY when not differentiating TCP and UDP

jibi
authored and
dhij
committed