Update python27 from 2.7.16 to 2.7.17 (#3557)

Tested on ARM.

packages/python27.rb

@@ -3,21 +3,13 @@ require 'package'
 class Python27 < Package
   description 'Python is a programming language that lets you work quickly and integrate systems more effectively.'
   homepage 'https://www.python.org/'
-  version '2.7.16'
-  source_url 'https://www.python.org/ftp/python/2.7.16/Python-2.7.16.tar.xz'
-  source_sha256 'f222ef602647eecb6853681156d32de4450a2c39f4de93bd5b20235f2e660ed7'
+  version '2.7.17'
+  source_url 'https://www.python.org/ftp/python/2.7.17/Python-2.7.17.tar.xz'
+  source_sha256 '4d43f033cdbd0aa7b7023c81b0e986fd11e653b5248dac9144d508f11812ba41'
 
   binary_url ({
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/python27-2.7.16-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/python27-2.7.16-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/python27-2.7.16-chromeos-i686.tar.xz',
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/python27-2.7.16-chromeos-x86_64.tar.xz',
   })
   binary_sha256 ({
-    aarch64: '16265a3e01624006c7446d4e0f59ff8b497f351bad14d3d326e17511c2711095',
-     armv7l: '16265a3e01624006c7446d4e0f59ff8b497f351bad14d3d326e17511c2711095',
-       i686: 'b098571da5c664c9e777d48b0f50ef9c3bf4ffd1aebf5edcdad48ef60a940d6c',
-     x86_64: '4987e4e3fd77e1db8233c2d2652174c519001b6ab2cd2989c3329268e093d701',
   })
 
   depends_on 'bz2' => :build