[SERVER-3112] mongo* tools logs should not log to stdout (broken w/--out -) - MongoDB

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Log output for tools should probably go to stderr, not stdout; esp. for any tools that writes data to stdout.

is duplicated by

SERVER-3577 mongoexport verbose logging echoes to stdout

is related to

SERVER-4169 mongodump should be more quiet

TOOLS-140 bsondump produces invalid JSON

SERVER-9268 Use existing logging framework to standardize logging in tools

related to

SERVER-2011 mongodump, bsondump and mongoexport should only write to stderr in case of a serious error