gentoolkit: upgraded package to upstream

Upgraded app-portage/gentoolkit to version 0.3.0.6-r3 on amd64

BUG=chromium-os:31030
TEST=`cbuildbot chromiumos-sdk` worked
CQ-DEPEND=CL:39313

Change-Id: I3e77b0fc2f0d7c5b43b13a61cec05a9f791bcda3
Reviewed-on: https://gerrit.chromium.org/gerrit/39314
Reviewed-by: Matt Tennant <mtennant@chromium.org>
Reviewed-by: Brian Harring <ferringb@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
16 files changed