test [nfc]: Ensure user IDs, message IDs, etc. are positive #877
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Zulip user IDs, message IDs, and stream/channel IDs (and anything else that's an ID of a row in the server database) are positive integers. So are our account IDs. To help keep test data realistic, enforce those in the example-data functions.
This follows up on 739fa84 (in #828; /cc @sm-sayedi), which made a similar fix for one test case.