Remove `urllib2` and `SocketServer`

[mtelka]

There are few places where urllib2 is still mentioned. Namely:

• llvm-project/lld/utils/benchmark.py

  Line 22 in e8ce6c4

  from urllib2 import urlopen, Request

• llvm-project/clang/tools/scan-view/bin/scan-view

  Line 16 in e8ce6c4

  from urllib2 import urlopen

• llvm-project/llvm/utils/unicode-case-fold.py

  Line 28 in e8ce6c4

  from urllib2 import urlopen

• llvm-project/clang/docs/tools/dump_ast_matchers.py

  Line 13 in e8ce6c4

  from urllib2 import urlopen

Since urllib2 is python2-only thing and since Python 2 is no longer supported by LLVM then I believe all traces of urllib2 could be safely removed.

[mtelka]

Please note that SocketServer is similar case:

• llvm-project/clang/tools/scan-view/bin/scan-view

  Line 89 in d7d0e74

  import SocketServer as socketserver

[vinay-deshmukh]

I'd like to work on this!

@mtelka

other than these imports, do we want to get rid of other python2-isms within llvm/test/

AFAICT, some of the other tools (like clang-format do still support using python2.x)

edit:

There's also quite a few usages of :

from __future_ import print_function

which is a Python2.x thing.

Is there a reference list available detailing which sections of llvm support only >= Python 3.X vs which sections target both 2.x and 3.x? Using that list we can clean up the rest of the python2 usages as well

[mtelka]

@vinay-deshmukh I've no idea. You probably should ask llvm developers.