dev-python: pull in packages from upstream

The following packages are added:
 - cheetah
 - configobj
 - jsonpatch
 - jsonpointer
 - markdown
 - oauth
 - prettytable

BUG=brillo:823
TEST='sudo emerge dev-python/*'

Change-Id: Ic701c808e4acb4bf295bd9e51bc32eb6baf6538d
Reviewed-on: https://chromium-review.googlesource.com/266124
Tested-by: Andrey Ulanov <andreyu@google.com>
Reviewed-by: Andrey Ulanov <andreyu@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Andrey Ulanov <andreyu@google.com>
21 files changed