podman-remote ps --external --pod --sort do not work.

Fixup the bindings and the handling of the --external --por and --sort
flags.

The --storage option was renamed --external, make sure we use
external up and down the stack.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

pkg/api/server/register_containers.go

@@ -48,6 +48,11 @@ func (s *APIServer) registerContainersHandlers(r *mux.Router) error {
 	//    default: false
 	//    description: Return all containers. By default, only running containers are shown
 	//  - in: query
+	//    name: external
+	//    type: boolean
+	//    default: false
+	//    description: Return containers in storage not controlled by Podman
+	//  - in: query
 	//    name: limit
 	//    description: Return this number of most recently created containers, including non-running ones.
 	//    type: integer