Ian Wienand 2e261fdc42 zuul-*: use multiline formatter
Zuul change I6d7e7e7a9e19d46a744f9ffac8d532fc6b4bba01 introduced a
multi-line formatter that makes exceptions and other multi-line output
much easier to follow in the logs.  Use it here for the simple
formatter in the production Zuul deployment.

Change-Id: I9a8aad8a90f5f4080cdb872d0ed65697a180f57c
2021-12-13 14:54:16 +11:00
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