Replace usage of six.moves.urllib with urllib

Also organize some of the imports. Now that Servo only uses Python 3,
this module is unnecessary. This is part of the gradual migration to
using only Python 3.

python/servo/bootstrap.py

@@ -10,7 +10,7 @@ import os
 import distro
 import subprocess
 import six
-import six.moves.urllib as urllib
+import urllib
 from subprocess import PIPE
 from zipfile import BadZipfile
 

python/servo/bootstrap_commands.py

@@ -10,6 +10,7 @@
 from __future__ import absolute_import, print_function, unicode_literals
 
 import base64
+import glob
 import json
 import os
 import os.path as path
@@ -18,8 +19,7 @@ import re
 import subprocess
 import sys
 import traceback
-import six.moves.urllib as urllib
-import glob
+import urllib
 
 from mach.decorators import (
     CommandArgument,

python/servo/build_commands.py

@@ -15,11 +15,11 @@ import os
 import os.path as path
 import platform
 import shutil
+import stat
 import subprocess
 import sys
-import six.moves.urllib as urllib
+import urllib
 import zipfile
-import stat
 
 from time import time
 

python/servo/command_base.py

@@ -9,35 +9,36 @@
 
 from __future__ import print_function
 
-from errno import ENOENT as NO_SUCH_FILE_OR_DIRECTORY
-from glob import glob
-import shutil
+import contextlib
+import distro
+import functools
 import gzip
 import itertools
+import json
 import locale
 import os
-from os import path
 import platform
-import distro
 import re
-import contextlib
-import subprocess
-from subprocess import PIPE
+import shutil
 import six
+import subprocess
 import sys
 import tarfile
+import urllib
 import zipfile
-import functools
+
+from errno import ENOENT as NO_SUCH_FILE_OR_DIRECTORY
+from glob import glob
+from os import path
+from subprocess import PIPE
+
+import toml
+
 from xml.etree.ElementTree import XML
 from servo.util import download_file
-import six.moves.urllib as urllib
 from .bootstrap import check_gstreamer_lib
-
 from mach.decorators import CommandArgument
 from mach.registrar import Registrar
-import toml
-import json
-
 from servo.packages import WINDOWS_MSVC as msvc_deps
 from servo.util import host_triple
 

python/servo/devenv_commands.py

@@ -11,12 +11,12 @@ from __future__ import print_function, unicode_literals
 from os import path, listdir, getcwd
 from time import time
 
+import json
 import signal
+import subprocess
 import sys
 import tempfile
-import six.moves.urllib as urllib
-import json
-import subprocess
+import urllib
 
 from mach.decorators import (
     CommandArgument,

python/servo/package_commands.py

@@ -21,7 +21,7 @@ import shutil
 import subprocess
 import sys
 import tempfile
-import six.moves.urllib as urllib
+import urllib
 import xml
 
 from mach.decorators import (

python/servo/util.py

@@ -14,14 +14,14 @@ import os
 import os.path
 import platform
 import shutil
-from socket import error as socket_error
 import stat
-from io import BytesIO
 import sys
 import time
+import urllib
 import zipfile
-import six.moves.urllib as urllib
 
+from io import BytesIO
+from socket import error as socket_error
 
 try:
     from ssl import HAS_SNI