Change 28158

tom_tyler (C. Thomas Tyler)
C. Thomas Tyler committed this change into / under Review 28159
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Made former '-n' preview mode the default behavior.
Added new '-y' flag to execute a real upgrade.

Added a message in preview mode to clarify that no actual
upgrade is performed.

Removed the '-n' preview option, as preview mode is now the
default behavior.

#review-28159
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