VPP-1508 python3 tests: xrange

VPP-1508 python3 tests: xrange

xrange is not supported. Use six.range.

py27 runtests: commands[5] | stestr --test-path ./test run --slowest test_ip4 test_ip6
==============================================================================
IPv4 disabled
==============================================================================
==============================================================================
ICMP Echo Test Case
==============================================================================
{0} test.test_ip4.TestIPDisabled.test_ip_disabled [5.256819s] ... ok
07:24:41,902 Couldn't stat : /tmp/vpp-unittest-TestICMPEcho-hU4IsB/stats.sock
{1} test.test_ip4.TestICMPEcho.test_icmp_echo [0.367035s] ... ok
==============================================================================
IPv4 Deaggregate Routes
==============================================================================
==============================================================================
IPv4 Input Exceptions
==============================================================================
07:24:47,314 Couldn't stat : /tmp/vpp-unittest-TestIPDeag-eE1VgC/stats.sock
{1} test.test_ip4.TestIPDeag.test_ip_deag [5.895646s] ... ok
{0} test.test_ip4.TestIPInput.test_ip_input [5.819001s] ... ok
==============================================================================
IPv4 longest Prefix Match

... output truncated ...

==============================
Failed 4 tests - output below:
==============================

test.test_ip4.TestIPv4FibCrud.test_3_add_new_routes
---------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/vpp/test/test_ip4.py", line 509, in test_3_add_new_routes
        self.deleted_routes.remove(x)
    ValueError: list.remove(x): x not in list

test.test_ip4.TestIPv4FibCrud.test_2_del_routes
-----------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/vpp/test/test_ip4.py", line 478, in test_2_del_routes
        self.configured_routes.remove(x)
    ValueError: list.remove(x): x not in list

test.test_ip4_vrf_multi_instance.TestIp4VrfMultiInst.test_ip4_vrf_03
--------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/vpp/test/test_ip4_vrf_multi_instance.py", line 465, in test_ip4_vrf_03
        self.create_vrf_and_assign_interfaces(1)
      File "/vpp/test/test_ip4_vrf_multi_instance.py", line 189, in create_vrf_and_assign_interfaces
        pg_if.set_table_ip4(vrf_id)
      File "/vpp/test/vpp_interface.py", line 322, in set_table_ip4
        self.sw_if_index, 0, self.ip4_table_id)
      File "/vpp/test/vpp_papi_provider.py", line 264, in sw_interface_set_table
        'vrf_id': table_id})
      File "/vpp/test/vpp_papi_provider.py", line 196, in api
        raise UnexpectedApiReturnValueError(msg)
    test.vpp_papi_provider.UnexpectedApiReturnValueError: API call failed, expected 0 return value instead of -114 in sw_interface_set_table_reply(_0=91, context=1007, retval=-114)

test.test_ip4_vrf_multi_instance.TestIp4VrfMultiInst.test_ip4_vrf_02
--------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/vpp/test/test_ip4_vrf_multi_instance.py", line 445, in test_ip4_vrf_02
        self.reset_vrf_and_remove_from_vrf_list(1)
      File "/vpp/test/test_ip4_vrf_multi_instance.py", line 208, in reset_vrf_and_remove_from_vrf_list
        self.vapi.reset_fib(vrf_id, is_ipv6=0)
      File "/vpp/test/vpp_papi_provider.py", line 1137, in reset_fib
        'is_ipv6': is_ipv6,
      File "/vpp/test/vpp_papi_provider.py", line 196, in api
        raise UnexpectedApiReturnValueError(msg)
    test.vpp_papi_provider.UnexpectedApiReturnValueError: API call failed, expected 0 return value instead of -3 in reset_fib_reply(_0=259, context=1198, retval=-3)

======
Totals
======
Ran: 57 tests in 266.0000 sec.
 - Passed: 53
 - Skipped: 0
 - Expected Fail: 0
 - Unexpected Success: 0
 - Failed: 4
Sum of execute time for each test: 157.3925 sec.

==============
Worker Balance
==============
 - Worker 0 (29 tests) => 0:03:52.608995
 - Worker 1 (28 tests) => 0:04:08.615473
Test id                                        Runtime (s)
---------------------------------------------  -----------
test.test_ip_mcast.TestIPMcast.test_ip6_mcast  8.535
test.test_ip4.TestIPPunt.test_ip_punt          8.082
test.test_ip6.TestIP6Punt.test_ip_punt         6.582
test.test_ip6.TestIPDeag.test_ip_deag          6.175
test.test_ip6.TestIPv6.test_ns                 6.171
test.test_ip4.TestIPDeag.test_ip_deag          5.896
test.test_ip6.TestIPv6.test_fib                5.846
test.test_ip4.TestIPInput.test_ip_input        5.819
test.test_ip6.TestIPv6.test_rs                 5.737
test.test_ip4.TestIPv4.test_fib                5.267
ERROR: InvocationError for command '/vpp/.tox/py27/bin/stestr --test-path ./test run --slowest test_ip4 test_ip6' (exited with code 1)
______________________________________________________ summary ______________________________________________________
ERROR:   py27: commands failed
Change-Id: Id9f6ecb4897386f790d82ab908963e4971a3aac8
Signed-off-by: Paul Vinciguerra <pvinci@vinciconsulting.com>