dev-python/cryptography: Update dependencies for -1.9 from upstream gentoo

dev-python/cryptography-1.9 is required to fix a miscompilation with
OpenSSL 1.1.  However, this new version has the following prerequisites
that must be updated first:
  >=dev-python/cffi-1.7.
  >=dev-python/asn1crypto-0.21.0
  >=dev-python/idna-2.1

So, pull the latest ebuilds upstream gentoo, with these small changes:
 * EAPI=5
 * KEYWORDS=*
 * Remove 3_6 from PYTHON_CROMPAT

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>

BUG=chromium:734489
TEST=sudo emerge cffi asn1crypto idna
 => builds ok

Change-Id: I6d7e31aba7778f28181d68b9d19adc667487a82d
Reviewed-on: https://chromium-review.googlesource.com/538548
Commit-Ready: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
9 files changed