Warning (to stderr) about a future (non-existent) argument being required

[joshlang]

You guys have added this warning:

WARNING: The record set doesn't exist and is automatically created. In the future, an extra argument will be supported to confirm this auto creation.

Which appears when we run az network dns record-set txt add-record ... to add a new record.

This broke our pipeline because it's written to stderr.

It's no big deal - we just run it again and it's fine. And easily workaroundable with a redirect to /dev/null or /some-file.

But... there doesn't seem to be an argument at all to silence the warning, right now. Seems there should be. Guess it's coming "In the future", as the warning says :D

[yonzhan]

add to S168

[jiasli]

We have introduced --only-show-errors to prevent writing to stderr. Please see #12604 for details.