[Merge] ~nteodosio/software-properties:interim-releases into software-properties:ubuntu/master

[Sebastien Bacher]

Review: Needs Information

Thanks Nathan, it still seems the first chunk is changing the service description for every and not the interim release only no? My understanding was that the new description is only for the interim releases which don't include the extra updates but that the old text is to stay for LTSes
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https://code.launchpad.net/~nteodosio/software-properties/+git/software-properties/+merge/438549
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