Output "Summary of indexes" at top of pt-duplicate-key-checker report

Registered by Michael Coburn

Hi, it would be better if we put the summary at the top instead of at the bottom of the dup keys output. This is an example summary:

# ########################################################################
# Summary of indexes
# ########################################################################

# Size Duplicate Indexes 824
# Total Duplicate Indexes 16
# Total Indexes 193

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Michael Coburn
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