Description of problem:

https://rhos-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/neutron-dsvm-functional-rhos-coreci/1233/console

The following functional test is failing consistently on OSP8 on our internal CI.

neutron.tests.functional.agent.linux.test_utils.TestGetRootHelperChildPid.test_get_root_helper_child_pid_returns_first_child

15:09:03 Captured traceback:
15:09:03 ~~~~~~~~~~~~~~~~~~~
15:09:03     Traceback (most recent call last):
15:09:03       File "neutron/tests/functional/agent/linux/test_utils.py", line 90, in test_get_root_helper_child_pid_returns_first_child
15:09:03         sleep=0.1)
15:09:03       File "neutron/agent/linux/utils.py", line 345, in wait_until_true
15:09:03         while not predicate():
15:09:03       File "neutron/tests/functional/agent/linux/test_utils.py", line 73, in wait_for_sleep_is_spawned
15:09:03         ['pstree', parent_pid], check_exit_code=False)
15:09:03       File "neutron/agent/linux/utils.py", line 120, in execute
15:09:03         addl_env=addl_env)
15:09:03       File "neutron/agent/linux/utils.py", line 89, in create_process
15:09:03         stderr=subprocess.PIPE)
15:09:03       File "neutron/common/utils.py", line 202, in subprocess_popen
15:09:03         close_fds=close_fds, env=env)
15:09:03       File "/usr/lib/python2.7/site-packages/eventlet/green/subprocess.py", line 53, in __init__
15:09:03         subprocess_orig.Popen.__init__(self, args, 0, *argss, **kwds)
15:09:03       File "/usr/lib64/python2.7/subprocess.py", line 711, in __init__
15:09:03         errread, errwrite)
15:09:03       File "/usr/lib64/python2.7/subprocess.py", line 1327, in _execute_child
15:09:03         raise child_exception
15:09:03     OSError: [Errno 2] No such file or directory
15:09:03     


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