runtime: deprecate runc --criu / -criu-path option

runc option --criu is now ignored (with a warning), and the option will be
removed entirely in a future release. Users who need a non- standard criu
binary should rely on the standard way of looking up binaries in $PATH.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

runtime/v1/shim/client/client.go

@@ -197,9 +197,6 @@ func newCommand(binary, daemonAddress string, debug bool, config shim.Config, so
 		"-containerd-binary", selfExe,
 	}
 
-	if config.Criu != "" {
-		args = append(args, "-criu-path", config.Criu)
-	}
 	if config.RuntimeRoot != "" {
 		args = append(args, "-runtime-root", config.RuntimeRoot)
 	}