There is a wrong variable format used in msg of ilo function _update_capabilities

node_capabilities = node.properties.get('capabilities')
if node_capabilities:
 try:
  cap_dict = dict(x.split(':', 1)
      for x in node_capabilities.split(','))
 except ValueError:
  # Capabilities can be filled by operator. ValueError can
  # occur in malformed capabilities like:
  # properties/capabilities='boot_mode:bios,boot_option'.
  msg = (_("Node %(node)s has invalid capabilities string "
    "%(capabilities), unable to modify the node "
    "properties['capabilities'] string")
    % {'node': node.uuid, 'capabilities': node_capabilities})

The '%(capabilities)' should be '%(capabilities)s' in msg.