Add logging to 'ps' to diagnose test failures.

BUG=chromium-os:30437
TEST=security_ReservedPrivileges writes the output of 'ps' to
'<resultsdir>/ps_output'.

Change-Id: I70b760ee93b552a0fa0e003ac74077dd5608fcf5
Reviewed-on: https://gerrit.chromium.org/gerrit/21698
Tested-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Reviewed-by: Jim Hebert <jimhebert@chromium.org>
1 file changed