devtools/lib/testutil: skip generating xunit report for errors for presubmit-test itself.
devtools/lib/testutil: skip generating xunit report for errors for presubmit-test itself.

Change-Id: I9c59dd27a2050ddb56580e79255f41271e3511de

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