Fail on non-zero exit code from tested subprocess
Fail on non-zero exit code from tested subprocess

Normally the server process should exit with code 0. Non-zero might
indicate crash during shutdown or so.

This can be used for automated Valgrind testing:
$ make DAEMON=valgrind ADDITIONAL="--error-exitcode=1 kresd"

CZ-NIC/deckard,CZ-NIC/deckard