This variable is better renamed to 'topics' to
match the typical message queue kind of syntax/usage since
each entry in this dictionary is nearly equivalent to a
specific topic channel about a event (with the dictionary
value being the set of targets/listeners that are registered
on that channel who will get notified about any channel/topic
activity).
Change-Id: Ie76e9cc4e29f4e542be987561cd6872e021cfa58