Iggy's feedback on the postfix SLS

[xenophonf]

8[14:15] iggy: I'd make the IDs less generic
8[14:16] iggy: and indent some of that nested jinja
8[14:16] iggy: don't use mapping
8[14:16] iggy: it's a relatively recent addition to jinja
8[14:17] iggy: so you'll end up with people filing bugs saying it broke
8[14:17] iggy: hooray for old Distros that won't die and people that won't upgrade
8[14:18] iggy: take out all those for loop else's
8[14:19] iggy: and I wouldn't use content like that
8[14:19] iggy: use templated files
8[14:19] iggy: and put at the top that the files are managed by salt and shouldn't be altered
8[14:20] iggy: I get not wanting to put mostly useless files in your tree, but it's kind of the standard (and frankly easier to follow than a shit ton of for's/if's/else's/etc all crammed into a content block)