podmanV2: implement logs

Implement the `podman {container} logs` for the v2 client. The remote
client does not yet support it.  There's some more work needed for the
rest api; some options are missing (e.g., printing names) while others
are broken (e.g., the until http parameter).

The remote parts will be tackled in a future change.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

pkg/api/handlers/compat/containers.go

@@ -261,6 +261,7 @@ func LogsFromContainer(w http.ResponseWriter, r *http.Request) {
 
 	var until time.Time
 	if _, found := r.URL.Query()["until"]; found {
+		// FIXME: until != since but the logs backend does not yet support until.
 		since, err = util.ParseInputTime(query.Until)
 		if err != nil {
 			utils.BadRequest(w, "until", query.Until, err)