Add patches for Yum and urlgrabber

etc/portage/patches/dev-python/urlgrabber/python2-shebang.patch

@@ -0,0 +1,18 @@
+diff -ru a/scripts/urlgrabber b/scripts/urlgrabber
+--- a/scripts/urlgrabber	2013-08-26 02:09:07.000000000 -0500
++++ b/scripts/urlgrabber	2017-05-19 07:50:43.146566860 -0500
+@@ -1,4 +1,4 @@
+-#!/usr/bin/python -t
++#!/usr/bin/python2 -t
+ 
+ #   This library is free software; you can redistribute it and/or
+ #   modify it under the terms of the GNU Lesser General Public
+diff -ru a/scripts/urlgrabber-ext-down b/scripts/urlgrabber-ext-down
+--- a/scripts/urlgrabber-ext-down	2013-08-26 02:09:07.000000000 -0500
++++ b/scripts/urlgrabber-ext-down	2017-05-19 07:50:49.098783105 -0500
+@@ -1,4 +1,4 @@
+-#! /usr/bin/python
++#! /usr/bin/python2
+ #  A very simple external downloader
+ #  Copyright 2011-2012 Zdenek Pavlas
+ 

etc/portage/patches/sys-apps/yum/shebang-python2.patch

@@ -0,0 +1,16 @@
+--- a/bin/yum.py	2017-05-19 07:46:21.720998112 -0500
++++ b/bin/yum.py	2017-05-19 07:46:03.601283796 -0500
+@@ -1,4 +1,4 @@
+-#!/usr/bin/python
++#!/usr/bin/python2
+ import sys
+ try:
+     import yum
+--- a/bin/yum-updatesd.py	2017-05-19 07:46:31.034365265 -0500
++++ b/bin/yum-updatesd.py	2017-05-19 07:46:03.601283796 -0500
+@@ -1,4 +1,4 @@
+-#!/usr/bin/python
++#!/usr/bin/python2
+ import sys, os
+ import optparse
+