Maintenance release for 2022

[teutat3s]

• [x] passes make build lint integration

I know this is a big looking PR and I'd like to gather feedback whether upstream is interested in any of the changes. If interested, I could also break this up into into several smaller ones, if that is preferred.

Feature changes include Changelog Incorporated several pull requests, adding one feature and fixing one issue:

• Run as user per job #570 fixed by PR #584
• Fix broken integration tests #586

Other notably bigger changes:

• moved project to go modules
• removed unnecessary glide dependency

Lots of smaller changes, mainly maintenance related:

• bump minimum go version to 1.17
• bump go dependencies and fixes for prometheus upstream API changes
• bump consul version to 1.11.4
• linting: use staticcheck instead of deprecated golint
• apply staticcheck lint changes
• make scripts work on NixOS
• some gofmt

Summaries: Changes since last upstream release 3.8.0 https://github.com/joyent/containerpilot/compare/3.8.0...greenbaum:3.8.4 Changes since last forked release 3.8.3 https://github.com/greenbaum/containerpilot/compare/3.8.3...greenbaum:3.8.4

[teutat3s]

A successful CI run can be inspected here by the interested reader https://drone.greenbaum.cloud/greenbaum.cloud/containerpilot/40

[danmcd]

I'm sorry for not having looked at this. There's a lot here. I've added myself and two others as reviewers. I see there are test results above, which may help us in making the decision to merge.

I'm thinking it should be a series of smaller squashable-to-one-commit PRs, however, as that's how we normally roll (squish one PR into one commit).