Enhance error handling

theodolite-benchmarks/docker-test/smoketest-runner.sh

theodolite-benchmarks/docker-test/uc2-beam-flink/test.sh

theodolite-benchmarks/docker-test/uc2-beam-samza/test.sh

theodolite-benchmarks/docker-test/uc2-flink/test.sh

theodolite-benchmarks/docker-test/uc2-kstreams/test.sh

theodolite-benchmarks/docker-test/uc3-beam-flink/test.sh

theodolite-benchmarks/docker-test/uc3-beam-samza/test.sh

theodolite-benchmarks/docker-test/uc3-kstreams/test.sh

theodolite-benchmarks/docker-test/uc4-beam-flink/test.sh

theodolite-benchmarks/docker-test/uc4-beam-samza/test.sh

theodolite-benchmarks/docker-test/uc4-flink/test.sh

theodolite-benchmarks/docker-test/uc4-kstreams/test.sh