vendor: update gopsutil to v2.19.6

[greut]

The Stolen field has been removed, shirou/gopsutil#677 as it wasn't used. This pull request upgrade that dependency and corrects the code accordingly.

gopsutil 2.19.7 introduce breaking changes with the vendored version of docker; pretty please update docker.

Closes #6483, #6957

[notnoop]

Thank you so much for your contribution. I'm afraid upgrading gopsutil is a bit more complicated.

2.18.12 introduced a backward compatible change to windows cpu handling in shirou/gopsutil@eead265 .

We aim to upgrade docker and gopsutil to the latest, at least so we can pick up a panic fix in 2.20.1 shirou/gopsutil@3964e5b .

We'd appreciate any PR that upgrades docker/gopsutil to the latest, though I'm also aiming to get the packages upgraded for 0.11.

[greut]

@notnoop I see, this issue is way harder that I thought. Should I try again that one? #5807

[notnoop]

That'd be wonderful indeed. fwiw, I had a WIP branch in https://github.com/hashicorp/nomad/commits/b-update-gopsutil-20200127 but I haven't gotten it across the line. Two commits are fixes to changes in gopsutil and docker types, but I assume we need more govendor magic incantations to get this working :(.

[greut]

@notnoop Great... IIRC I had to battle quite a lot with govendor. I'm closing this then.

[github-actions]

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