ARROW-1864: [Java] Upgrade Netty to 4.1.17#1376

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zsxwing wants to merge 4 commits intoapache:masterfrom

zsxwing:ARROW-1864

Commits on Dec 1, 2017

Upgrade Netty to 4.1.x

zsxwing
authored and
wesm
committed
Add methods back

zsxwing
authored and
wesm
committed

Commits on Dec 4, 2017

Add comment for calculateNewCapacity
zsxwing
committed

Commits on Dec 5, 2017

extend AbstractByteBufAllocator; add javadoc for new methods
zsxwing
committed