Backport removing let in for loop declaration#9553

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MylesBorins wants to merge 4 commits intonodejs:v4.x-stagingfrom

MylesBorins:no-let-in-loops

Commits on Nov 11, 2016

lib: remove let from for loops
Myles Borins
committed
streams: fix regression in `unpipe()`

addaleax
authored and
Myles Borins
committed
test: add regression test for `unpipe()`

Niels Nielsen
authored and
Myles Borins
committed
tools: avoid let in for loops

jalafel
authored and
Myles Borins
committed