Revert "VPP-1508 python3 tests: raw_input"

This reverts commit 72f0004ac5.

Reason for revert: Traceback (most recent call last):
  File "/home/ksekera/vpp/test/test_ipsec_ah.py", line 36, in
setUpClass
    super(TemplateIpsecAh, cls).setUpClass()
  File "/home/ksekera/vpp/test/template_ipsec.py", line 105, in
setUpClass
    super(TemplateIpsec, cls).setUpClass()
  File "/home/ksekera/vpp/test/framework.py", line 459, in setUpClass
    cls.quit()
  File "/home/ksekera/vpp/test/framework.py", line 475, in quit
    six.input("When done debugging, press ENTER to kill the "
AttributeError: 'module' object has no attribute 'input'

Change-Id: Idf0bbfea231730b37bae5dcb4557a0f82ab1b810
Signed-off-by: Ole Troan <ot@cisco.com>

test/framework.py

@@ -1,41 +1,36 @@
 #!/usr/bin/env python
 
 from __future__ import print_function
-
-import copy
 import gc
-import os
-import random
-import select
-import six
 import sys
+import os
+import select
+import unittest
 import tempfile
 import time
-import unittest
-from collections import deque
-from inspect import getdoc, isclass
-from logging import FileHandler, DEBUG, Formatter
-from threading import Thread, Event
-from traceback import format_exception
-
 import faulthandler
+import random
+import copy
 import psutil
+from collections import deque
+from threading import Thread, Event
+from inspect import getdoc, isclass
+from traceback import format_exception
+from logging import FileHandler, DEBUG, Formatter
+from scapy.packet import Raw
+from hook import StepHook, PollHook, VppDiedError
+from vpp_pg_interface import VppPGInterface
+from vpp_sub_interface import VppSubInterface
+from vpp_lo_interface import VppLoInterface
+from vpp_papi_provider import VppPapiProvider
+from vpp_papi.vpp_stats import VPPStats
+from log import RED, GREEN, YELLOW, double_line_delim, single_line_delim, \
+    get_logger, colorize
+from vpp_object import VppObjectRegistry
+from util import ppp, is_core_present
 from scapy.layers.inet import IPerror, TCPerror, UDPerror, ICMPerror
 from scapy.layers.inet6 import ICMPv6DestUnreach, ICMPv6EchoRequest
 from scapy.layers.inet6 import ICMPv6EchoReply
-from scapy.packet import Raw
-from vpp_papi.vpp_stats import VPPStats
-
-from hook import StepHook, PollHook, VppDiedError
-from log import RED, GREEN, YELLOW, double_line_delim, single_line_delim, \
-    get_logger, colorize
-from util import ppp, is_core_present
-from vpp_lo_interface import VppLoInterface
-from vpp_object import VppObjectRegistry
-from vpp_papi_provider import VppPapiProvider
-from vpp_pg_interface import VppPGInterface
-from vpp_sub_interface import VppSubInterface
-
 if os.name == 'posix' and sys.version_info[0] < 3:
     # using subprocess32 is recommended by python official documentation
     # @ https://docs.python.org/2/library/subprocess.html
@@ -332,7 +327,7 @@ class VppTestCase(unittest.TestCase):
             print("Now is the time to attach a gdb by running the above "
                   "command and set up breakpoints etc.")
         print(single_line_delim)
-        six.input("Press ENTER to continue running the testcase...")
+        raw_input("Press ENTER to continue running the testcase...")
 
     @classmethod
     def run_vpp(cls):
@@ -472,7 +467,7 @@ class VppTestCase(unittest.TestCase):
                 print(double_line_delim)
                 print("VPP or GDB server is still running")
                 print(single_line_delim)
-                six.input("When done debugging, press ENTER to kill the "
+                raw_input("When done debugging, press ENTER to kill the "
                           "process and finish running the testcase...")
 
         # first signal that we want to stop the pump thread, then wake it up