increase writeLen for tests that want to trigger buffering
Summary: Freshly opened TCP sockets can have a send buffer size bigger than wmem_default, because connection parameters are cached in the route cache. Some of the async socket tests assumed that writing 8M of data was enough to guarantee blocking behavior, but since wmem_max is 20M on our systems the resulting tests are flaky. Reviewed By: marcinpe Differential Revision: D4292201 fbshipit-source-id: ba5d606d080330e455eee2b17bcae6cf546bf981
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