d715bae429
Ensure all shell system tests are executed with the errexit option set.
This prevents unchecked return codes from commands in the test from
interfering with the tests, since any failures need to be handled
explicitly.
(cherry picked from commit 01bc805f89)
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SPDX-License-Identifier: MPL-2.0
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Tests of runtime checks, e.g., that named prevents duplicate processes
from running.