[Routing] Reduce memory usage of a high consuming test case #17104
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Tests fail transiently on hhvm because of the high memory usage of this test case.
This patch cuts it by two.
See this blackfire comparison graph on the Memory dimension:
https://blackfire.io/profiles/compare/fd72ee66-e4d0-4ac2-92bf-16dd3849ef4c/graph?settings%5Bdimension%5D=pmu