fix bugs#6

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azurewang wants to merge 5 commits intoopenresty:masterfrom

azurewang:master

Commits on Mar 1, 2013

bug fix: result error on receive large packet(more than 16MB).
azurewang
committed

Commits on Mar 2, 2013

added test for large query
azurewang
committed

Commits on Mar 23, 2013

modity test desc: set mysqld: max-allowed-packet=200m
azurewang
committed

Commits on Mar 24, 2013