python3: remove major version check

configtool.py

@@ -13,16 +13,6 @@
 
 from __future__ import print_function
 import sys
-import time
-
-if sys.version_info.major >= 3:
-    print(
-        "You are currently running Python3. Python3 is not supported.\n"
-        "Please try running with Python2.\n\n"
-        'It often works to type "python2 configtool.py" in the command line.'
-    )
-    time.sleep(10)
-    sys.exit(-1)
 
 import getopt
 import os.path