tests/bench: import wrapper script used for blog charts

tests/bench/linux_record_cpu_net.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+#
+# Wrap a run of Ansible playbook so that CPU usage counters and network
+# activity are logged to files.
+#
+
+[ ! "$1" ] && exit 1
+sudo tcpdump -w $1-out.cap -s 0 host k1.botanicus.net &
+date +%s.%N > $1-task-clock.csv
+perf stat -x, -I 25 -e task-clock --append -o $1-task-clock.csv ansible-playbook run_hostname_100_times.yml
+sudo pkill -f tcpdump