handover_tests.sh: update stdout/stderr only on capital -U arg

On -u, update the handover_tests.ok file that lists all tests that are
expected to run. This is necessary for the regression tests to succeed.

Update all the numerous test_*.ho_vty.{err,ok} files only when the
update arg is a captial -U, because those are usually not interesting,
except for manual comparison of test runs.

Change-Id: Id280a8d084fd84b0b7486a5c8022e5b7a26f6095
1 file changed