8356438: Update OutputAnalyzer to optionally print process output as it happens

[friedbyalice]

The implemented solution modifies the OutputBuffer implementation instead of the OutputAnalyzer implementation.
This is because the OutputBuffer implementation which handles processes (LazyOutputBuffer) starts a thread in its constructor, so we would need to add a strange additional constructor parameter to the OutputBuffer.of(Process, Charset) static method, while the printing through to stdout (and stderr) only makes sense for LazyOutputBuffer.

I believe changing the config option from outputanalyzer.verbose to output buffer.verbose would make it cleaner, and avoid referencing the OutputAnalyzer in the OutputBuffer implementation.

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Issue

• JDK-8356438: Update OutputAnalyzer to optionally print process output as it happens (Enhancement - P4)

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