rsync: upgraded package to upstream

Upgraded net-misc/rsync to version 3.1.2 on amd64, arm, x86

BUG=chromium:710111
TEST=for b in link bob x86-generic; do
  FEATURES=test emerge-$b -q --nodeps net-misc/rsync; done
The tests don't pass on arm (didn't pass for 3.1.1 either), so I also
deployed onto a bob device and did some basic checking.

Change-Id: I01d9f7172e53ea089bc00f426f2c4976a2cba16c
Reviewed-on: https://chromium-review.googlesource.com/480996
Commit-Ready: Benjamin Gordon <bmgordon@chromium.org>
Tested-by: Benjamin Gordon <bmgordon@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
6 files changed