oncall-data-collector: dump the output of timed out commands
oncall-data-collector: dump the output of timed out commands

In combination with the earlier change to send SIGQUIT, this should give
us insight into what the hanging commands were up to.

Change-Id: I1e91b9292210422c550839c0ef212adc35afb1ff

vanadium/go.devtools,vanadium/go.devtools,vanadium/go.devtools