f80a206aa4
In most of our codebase when we referenced "ipv4" and "ipv6" on the right-hand-side of an assignment, we lowercases it (on the left-hand-side we used CamelCase, and thus "IPv4" and "IPv6"). In particular all across the networkd codebase the various "per-protocol booleans" use the lower-case spelling. Hence, let's use lower-case for SocketBindAllow=/SocketBindDeny= too, just make sure things feel like they belong together better. (This work is not included in any released version, hence let's fix this now, before any fixes in this area would be API breakage) Follow-up for #17655
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