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The execdriver pipes setup uses OS pipes with fds so that they can be chown'ed to the remapped root user for proper access. Recent flakiness in certain short-lived tests (usually via the "exec" path) reveals that the copy routines are not completing before exit/tear-down. This fix adds synchronization and proper closure such that these routines exit successfully. Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)