[SPARK-7841][BUILD] Stop using retrieveManaged to retrieve dependencies in SBT#9575

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JoshRosen wants to merge 2 commits intoapache:masterfrom

JoshRosen:SPARK-7841

Commits on Nov 9, 2015

Remove retrieveManaged and add logic to continue copying datanucleus jars.
JoshRosen
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Fix MiMA script to cope with empty lib_managed
JoshRosen
committed