Notifications: send DevCentral TrustSpace notifications to #wolfplex

Summary:
DevCentral fires notifications for TrustSpace in the 'trustspace'
group. This is for the Wolfplex IRC channel, not for our firehose
log channel.

This is a follow-up for 5c060931.

Test Plan: Fire a notification from DevCentral

Reviewers: dereckson

Subscribers: ledesillusionniste

Differential Revision: http://devcentral.nasqueron.org/D395