[SPARK-3495][SPARK-3496] Backporting block replication fixes made in master to branch 1.1#3191

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tdas wants to merge 3 commits intoapache:branch-1.1from

tdas:replication-fix-branch-1.1-backport

Commits on Nov 10, 2014

[SPARK-3495] Block replication fails continuously when the replication target node is dead AND [SPARK-3496] Block replication by mistake chooses driver as target
tdas
committed
Fixed error in unit test.
tdas
committed

Commits on Nov 11, 2014

Merge remote-tracking branch 'apache-github/branch-1.1' into branch-1.1
tdas
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