* adding copyright header * fix fmt and a test
* Update tooling * Run gofumpt * go mod vendor
* just use an error string * Switch command to use new struct
* Carefully move changes from the plugin-cluster-reload branch into this clean branch off master. * Don't test this at this level, adequately covered in the api level tests * Change PR link * go.mod * Vendoring * Vendor api/sys_plugins.go