[release-branch.go1.7] go1.7rc2

Change-Id: I5473071f672f8352fbd3352e158d5be12823b58a
Reviewed-on: https://go-review.googlesource.com/25017
Run-TryBot: Chris Broadfoot <cbro@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

VERSION

-go1.7rc1
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+go1.7rc2
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