fix broker select error in arbiter#1565

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andyxning wants to merge 3 commits intoshinken-solutions:masterfrom

andyxning:arbiter-broker-select

Commits on Apr 9, 2015

fix broker select error in arbiter
ning.xie
committed
fix pep8 check error
ning.xie
committed

Commits on May 11, 2015

Delete test_broker_with_restart.py
andyxning
committed