gnt-node: Fix bug that inverts ssh-key-check behavior

Signed-off-by: Manuel Franceschini <livewire@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

scripts/gnt-node

@@ -148,7 +148,7 @@ def _RunSetupSSH(options, nodes):
     cmd.append("--debug")
   elif options.verbose:
     cmd.append("--verbose")
-  if options.ssh_key_check:
+  if not options.ssh_key_check:
     cmd.append("--no-ssh-key-check")
 
   cmd.extend(nodes)