[SPARK-25998] [CORE] Change TorrentBroadcast to hold weak reference of broadcast object#22995

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bkrieger wants to merge 8 commits intoapache:masterfrom

bkrieger:bk/torrent-broadcast-weak

Commits on Nov 8, 2018

use weak reference for torrent broadcast
Brandon Krieger
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Commits on Nov 9, 2018

fix compile
Brandon Krieger
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fix
Brandon Krieger
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no npe
Brandon Krieger
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no option
Brandon Krieger
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typo
Brandon Krieger
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Commits on Nov 26, 2018

code review
Brandon Krieger
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Commits on Nov 27, 2018

change sync
Brandon Krieger
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