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SIGTERM can happen normally in our tests, and the current code has a trap that makes it trigger a clean exit. This causes some errors to be masked, as we end up calling "exit 0" when they occur. The error message will still be displayed, but the caller script will assume it worked. This patch fixes the problem by adjusting the bash signal handlers, so that we ignore SIGTERM (so bash does not get killed by the exit handler) and exit with error on SIGINT (triggered by ctrl-c). Note that under some conditions the SIGTERM trap is not necessary, but this depends on the environment.