[SPARK-21522][CORE] Fix flakiness in LauncherServerSuite.
Handle the case where the server closes the socket before the full message has been written by the client. Author: Marcelo Vanzin <vanzin@cloudera.com> Closes #18727 from vanzin/SPARK-21522. (cherry picked from commit b1335018) Signed-off-by:Marcelo Vanzin <vanzin@cloudera.com>
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