python-dateutil: upgraded package to upstream

Upgraded dev-python/python-dateutil to version 2.7.2-r1 on amd64

Pulled the latest eclass/python-utils-r1.eclass from gentoo

https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/buildDetails?buildbucketId=8936748904661188448

BUG=chromium:870100
TEST=cros tryjob

Change-Id: Iba2865dac51408bfcf0d7570725d81e50de57b00
Reviewed-on: https://chromium-review.googlesource.com/1196690
Commit-Ready: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Jason Clinton <jclinton@chromium.org>
10 files changed