[SPARK-4803] [streaming] Remove duplicate RegisterReceiver message#3648

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ilayaperumalg wants to merge 3 commits intoapache:masterfrom

ilayaperumalg:RTActor-remove-prestart

Commits on Dec 9, 2014

Remove duplicate RegisterReceiver message
ilayaperumalg
committed

Commits on Jan 12, 2015

Fix StreamingListenerSuite's startedReceiverStreamIds size
ilayaperumalg
committed

Commits on Jan 14, 2015

Increase receiverInfo collector timeout to 2 secs
ilayaperumalg
committed