[llvm][clang] Remove handling of Python2 ConfigParser module name (#163727)

LLVM now requires Python >= 3.8, and ConfigParser was renamed to
configparser in 3.0:
https://docs.python.org/3/whatsnew/3.0.html#library-changes

A few places imported it under the Python2 name even for Python3, I have
swapped those to the Python3 name.

This was reported by https://pypi.org/project/vermin/ as the file having
incompatible versions. Since once import is 2.x and one is 3.x.

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

@@ -29,11 +29,7 @@ import socket
 import itertools
 
 import Reporter
-
-try:
-    import configparser
-except ImportError:
-    import ConfigParser as configparser
+import configparser
 
 ###
 # Various patterns matched or replaced by server.

clang/utils/check_cfc/check_cfc.py

@@ -56,11 +56,7 @@ import shutil
 import subprocess
 import sys
 import tempfile
-
-try:
-    import configparser
-except ImportError:
-    import ConfigParser as configparser
+import configparser
 import io
 
 import obj_diff

llvm/utils/lit/tests/Inputs/test-data-micro/dummy_format.py

@@ -1,9 +1,5 @@
 import os
-
-try:
-    import ConfigParser
-except ImportError:
-    import configparser as ConfigParser
+import configparser
 
 import lit.formats
 import lit.Test
@@ -16,7 +12,7 @@ class DummyFormat(lit.formats.FileBasedTest):
 
         source_path = test.getSourcePath()
 
-        cfg = ConfigParser.ConfigParser()
+        cfg = configparser.ConfigParser()
         cfg.read(source_path)
 
         # Create the basic test result.

llvm/utils/lit/tests/Inputs/test-data/dummy_format.py

@@ -1,9 +1,5 @@
 import os
-
-try:
-    import ConfigParser
-except ImportError:
-    import configparser as ConfigParser
+import configparser
 
 import lit.formats
 import lit.Test
@@ -16,7 +12,7 @@ class DummyFormat(lit.formats.FileBasedTest):
 
         source_path = test.getSourcePath()
 
-        cfg = ConfigParser.ConfigParser()
+        cfg = configparser.ConfigParser()
         cfg.read(source_path)
 
         # Create the basic test result.

llvm/utils/lit/tests/Inputs/xunit-output/dummy_format.py

@@ -1,9 +1,5 @@
 import os
-
-try:
-    import ConfigParser
-except ImportError:
-    import configparser as ConfigParser
+import configparser
 
 import lit.formats
 import lit.Test
@@ -16,7 +12,7 @@ class DummyFormat(lit.formats.FileBasedTest):
 
         source_path = test.getSourcePath()
 
-        cfg = ConfigParser.ConfigParser()
+        cfg = configparser.ConfigParser()
         cfg.read(source_path)
 
         # Create the basic test result.