[Merge] lp:~phablet-team/history-service/simplify_participant_filtering into lp:history-service/staging

[Tiago Salem Herrmann]

Review: Approve

awesome. thanks.
Just remove the comment that Roberto mentioned and we are good to go.
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https://code.launchpad.net/~phablet-team/history-service/simplify_participant_filtering/+merge/311674
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