refactor getPref to use uniform printing logic

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We add a local helper function to print a single setting. This is a
preparation to correctly print non-trivial types. The existing code
in getPref is ported over to use that function. By that, the output
of "wholeField" is changed slightly to always print the full path for
each setting (e.g. "security.serialEnabled" instead of
"security:\nserialEnabled"). This improves support for grepping on the
output.

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