[clang][tools][scan-view] Remove Python2 compatibility code in ScanView.py (#163747)

All these modules got new names or were moved around in Python 3.0:
https://docs.python.org/3/whatsnew/3.0.html#library-changes

LLVM requires Python >= 3.8 so we don't need to try Python2 naming.

Author: DavidSpickett

clang/tools/scan-view/share/ScanView.py

@@ -1,35 +1,18 @@
-from __future__ import print_function
-
-try:
-    from http.server import HTTPServer, SimpleHTTPRequestHandler
-except ImportError:
-    from BaseHTTPServer import HTTPServer
-    from SimpleHTTPServer import SimpleHTTPRequestHandler
+from http.server import HTTPServer, SimpleHTTPRequestHandler
 import os
 import sys
-
-try:
-    from urlparse import urlparse
-    from urllib import unquote
-except ImportError:
-    from urllib.parse import urlparse, unquote
-
+from urllib.parse import urlparse, unquote
 import posixpath
-
-if sys.version_info.major >= 3:
-    from io import StringIO, BytesIO
-else:
-    from io import BytesIO, BytesIO as StringIO
-
+from io import StringIO, BytesIO
 import re
 import shutil
 import threading
 import time
 import socket
 import itertools
+import configparser
 
 import Reporter
-import configparser
 
 ###
 # Various patterns matched or replaced by server.