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/container_exec.go

@@ -79,11 +79,11 @@ type ExecConfig struct {
 type ExecSession struct {
 	// Id is the ID of the exec session.
 	// Named somewhat strangely to not conflict with ID().
-	// nolint:stylecheck,revive
+	//nolint:stylecheck,revive
 	Id string `json:"id"`
 	// ContainerId is the ID of the container this exec session belongs to.
 	// Named somewhat strangely to not conflict with ContainerID().
-	// nolint:stylecheck,revive
+	//nolint:stylecheck,revive
 	ContainerId string `json:"containerId"`
 
 	// State is the state of the exec session.