slack-irc: support notificatons from other slack bots

[darkk]

#89 part 3 (AKA #114 part 2)

There is also an option in old slack-irc-config.json "muteBots": ["TOKENISH-STRING"].

hellais> ah right, yeah that option is used by my own fork of slack-irc that adds support for IRC->Slack bot notifications
hellais> ekmartin/slack-irc@master...hellais:feature/bot-notifications
hellais> if we don't use my fork, slack bot notifications will not propagate to IRC
hellais🐙> the reason for the muteBots option is that otherwise it will create a feedback loop between the bot then notifying of the bot
darkk> yep, I understand. Am I right that it mutes itself?
hellais> correct

See also ekmartin/slack-irc#50

[darkk]

That's WONTFIX as #ooni-bots is no longer bridged with IRC.