Use oplog_replay option to optimize queries on oplog#3

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poudro wants to merge 2 commits intorick446:masterfrom

poudro:master

Commits on Nov 6, 2012

add oplog_replay to prevent excessive time spent in oplog queries since index on capped collections don't work so well...
poudro
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Commits on Dec 3, 2012

update for new version of mongo new oplog AND to replay starting at last mark point when mmm crashes
poudro
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