[Merge] ~schopin/ubuntu-seeds/+git/platform:linux-sysctl-defaults into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:plucky

[Simon Chopin]

> I guess procps is too optional for this to be done as a dependency there?

procps in Debian adds a Recommends on the package (yet to be merged), I'm not particularly against morphing it to a Depends. The difference is that procps is in `required`, and I'm still unclear as to what the difference is between those two sets. I chose to add it to `minimal` to minimize the impact as much as possible.

> Does this handle the minimized image use case where the minimized image doesn't actually depend on the Ubuntu-minimal package?

Documentation is scarce on minimzed packages. From a chat I had with CPC folks I understood that it was built using the minimal seed but without Recommends, but I might have misunderstood?
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https://code.launchpad.net/~schopin/ubuntu-seeds/+git/platform/+merge/477742
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~schopin/ubuntu-seeds/+git/platform:linux-sysctl-defaults into ~ubuntu-core-dev/ubuntu-seeds/+git/platform:plucky.