hubot: drop the unused hubot-auth script

hubot-auth is CoffeeScript-only (needs porting) and nothing in the bots calls
robot.auth; remove it from hal8000's external scripts and drop HUBOT_AUTH_ADMIN
from both bots.

site-cookbooks/kosmos-hubot/attributes/default.rb

@@ -33,7 +33,6 @@ default['kosmos-hubot']['bots'] = {
       'HUBOT_IRC_REALNAME' => 'botka (kosmos)',
       'HUBOT_IRC_ROOMS' => '#kosmos,#kosmos-dev,#kosmos-random,#remotestorage,#hackerbeach,#unhosted,#sockethub,#mastodon',
       'HUBOT_IRC_UNFLOOD' => '100',
-      'HUBOT_AUTH_ADMIN' => 'bkero,raucao',
       'HUBOT_HELP_REPLY_IN_PRIVATE' => 'true',
       'REDIS_URL' => 'redis://localhost:6379?botka',
       'RS_LOGGER_USER' => 'kosmos@5apps.com',
@@ -53,7 +52,7 @@ default['kosmos-hubot']['bots'] = {
     'firewall' => { 'port' => 8082, 'source' => '10.1.1.0/24' },
     'external_scripts' => %w[
       hubot-help hubot-redis-brain hubot-rules hubot-incoming-webhook
-      hubot-auth @kredits/hubot-kredits
+      @kredits/hubot-kredits
     ],
     'secret_env' => {
       'HUBOT_XMPP_PASSWORD' => 'xmpp_password',
@@ -68,7 +67,6 @@ default['kosmos-hubot']['bots'] = {
     'env' => {
       'HUBOT_XMPP_USERNAME' => 'hal8000@kosmos.org/hubot',
       'HUBOT_XMPP_ROOMS' => 'kosmos@kosmos.chat,kosmos-dev@kosmos.chat,kredits@kosmos.chat,info@kosmos.chat,ops@kosmos.chat',
-      'HUBOT_AUTH_ADMIN' => '',
       'HUBOT_HELP_REPLY_IN_PRIVATE' => 'true',
       'HUBOT_RSS_PRINTSUMMARY' => 'false',
       'HUBOT_RSS_PRINTERROR' => 'false',