There's some old, nonfunctioning code in core/ referencing phd.bots:
$bots = $this->getHostAttribute('phd.bots');
if ($bots) {
foreach ($bots as $bot) {
// Disable bots for now since FreeNode is kicking phabot off when
// it tries to connect with a "SASL" error.
continue;
...This should simply be removed; the PhabricatorBot code was removed in D17756.