golangci-lint: enable nolintlint

The nolintlint linter does not deny the use of `//nolint`
Instead it allows us to enforce a common nolint style:
- force that a linter name must be specified
- do not add a space between `//` and `nolint`
- make sure nolint is only used when there is actually a problem

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

libpod/plugin/volume_api.go

@@ -35,8 +35,6 @@ var (
 	hostVirtualPath = "/VolumeDriver.Path"
 	mountPath       = "/VolumeDriver.Mount"
 	unmountPath     = "/VolumeDriver.Unmount"
-	// nolint
-	capabilitiesPath = "/VolumeDriver.Capabilities"
 )
 
 const (