contrail-test test discovery is failing on centos

[Vedamurthy Joshi]

Sanity on mainline on Centos has started to fail

Recently added junos-eznc has caused this failure

+ OS_TEST_PATH=./serial_scripts
+ testr list-tests
running=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-6000} \
${PYTHON:-python} -m subunit.run discover -t ./ ${OS_TEST_PATH:-./scripts} --list
--- stdout ---

Log file : /root/contrail-test/logs/keystone_tests.log

--- import errors ---
Failed to import test module: serial_scripts.md5.test_md5
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/unittest2/loader.py", line 456, in _find_test_path
    module = self._get_module_from_name(name)
  File "/usr/lib/python2.7/site-packages/unittest2/loader.py", line 395, in _get_module_from_name
    __import__(name)
  File "/root/contrail-test/serial_scripts/md5/test_md5.py", line 9, in <module>
    from base import Md5Base
  File "/root/contrail-test/serial_scripts/md5/base.py", line 18, in <module>
    from physical_router_fixture import PhysicalRouterFixture
  File "/root/contrail-test/fixtures/physical_router_fixture.py", line 5, in <module>
    from physical_device_fixture import PhysicalDeviceFixture
  File "/root/contrail-test/fixtures/physical_device_fixture.py", line 5, in <module>
    from common.device_connection import ConnectionFactory
  File "/root/contrail-test/common/device_connection.py", line 6, in <module>
    from jnpr.junos import Device
  File "/usr/lib/python2.7/site-packages/jnpr/junos/__init__.py", line 1, in <module>
    from jnpr.junos.device import Device
  File "/usr/lib/python2.7/site-packages/jnpr/junos/device.py", line 23, in <module>
    from jnpr.junos import exception as EzErrors
  File "/usr/lib/python2.7/site-packages/jnpr/junos/exception.py", line 1, in <module>
    from jnpr.junos import jxml
  File "/usr/lib/python2.7/site-packages/jnpr/junos/jxml.py", line 2, in <module>
    from ncclient.xml_ import NCElement
ImportError: cannot import name NCElement

Failed to import test module: serial_scripts.tor.test_bms
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/unittest2/loader.py", line 456, in _find_test_path
    module = self._get_module_from_name(name)
  File "/usr/lib/python2.7/site-packages/unittest2/loader.py", line 395, in _get_module_from_name
    __import__(name)
  File "/root/contrail-test/serial_scripts/tor/test_bms.py", line 9, in <module>
    from common.tor.base import *
  File "/root/contrail-test/common/tor/base.py", line 8, in <module>
    from physical_router_fixture import PhysicalRouterFixture
  File "/root/contrail-test/fixtures/physical_router_fixture.py", line 5, in <module>
    from physical_device_fixture import PhysicalDeviceFixture
  File "/root/contrail-test/fixtures/physical_device_fixture.py", line 5, in <module>
    from common.device_connection import ConnectionFactory
  File "/root/contrail-test/common/device_connection.py", line 6, in <module>
    from jnpr.junos import Device
  File "/usr/lib/python2.7/site-packages/jnpr/junos/__init__.py", line 1, in <module>
    from jnpr.junos.device import Device
  File "/usr/lib/python2.7/site-packages/jnpr/junos/device.py", line 23, in <module>
    from jnpr.junos import exception as EzErrors
  File "/usr/lib/python2.7/site-packages/jnpr/junos/exception.py", line 1, in <module>
    from jnpr.junos import jxml
  File "/usr/lib/python2.7/site-packages/jnpr/junos/jxml.py", line 2, in <module>
    from ncclient.xml_ import NCElement
ImportError: cannot import name NCElement
Non-zero exit code (2) from test listing.
+ exit 1
+ exit 1