In many cases the tables are largely the same, hence define a common set of macros to generate the common parts. This adds in a couple of missing specifiers here and there, so is more thant just refactoring: it actually fixes accidental omissions. Note that some entries that look like they could be unified under these macros can't really be unified, since they are slightly different. For example in the DNSSD service logic we want to use the DNSSD hostname for %H rather than the unmodified kernel one.
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