…de (flutter#174001)

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This tries flutter#173569 again

That PR was reverted, because I didn't know that `streamOutput` was the
one used during non-verbose mode

The logging logic is a bit convoluted, see:
flutter#173887


So this PR simply changes the condition from

```
if (!verbose && exitCode == 0)
```

To 

```
if (!verbose && exitCode == 0 && !skipErrorLog)
```

So that if we skipErrorLog (will be true for bonjour features), it
doesn't call `streamOutput`.

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issue. An issue is not required if the PR fixes something trivial like a
typo.*

Fixes flutter#172627

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