Create container hang

[hongbin]

Use latest version of python-zunclient, create a container hang:

ubuntu@ip-172-31-61-51:/opt/stack/python-zunclient$ zun run nginx
^CTraceback (most recent call last):
  File "/usr/local/bin/zun", line 10, in <module>
    sys.exit(main())
  File "/opt/stack/python-zunclient/zunclient/shell.py", line 766, in main
    map(encodeutils.safe_decode, sys.argv[1:]))
  File "/opt/stack/python-zunclient/zunclient/shell.py", line 703, in main
    args.func(self.cs, args)
  File "/opt/stack/python-zunclient/zunclient/v1/containers_shell.py", line 752, in do_run
    opts['entrypoint'] = zun_utils.parse_entrypoint(args.entrypoint)
  File "/opt/stack/python-zunclient/zunclient/common/utils.py", line 216, in parse_entrypoint
    return shlex.split(entrypoint)
  File "/usr/lib/python3.6/shlex.py", line 305, in split
    return list(lex)
  File "/usr/lib/python3.6/shlex.py", line 295, in __next__
    token = self.get_token()
  File "/usr/lib/python3.6/shlex.py", line 105, in get_token
    raw = self.read_token()
  File "/usr/lib/python3.6/shlex.py", line 136, in read_token
    nextchar = self.instream.read(1)
KeyboardInterrupt

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/719093

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/719093
Committed: https://git.openstack.org/cgit/openstack/python-zunclient/commit/?id=75d2d10a8159f89b60a6366a326b5183cd33e926
Submitter: Zuul
Branch: master

commit 75d2d10a8159f89b60a6366a326b5183cd33e926
Author: Hongbin Lu <email address hidden>
Date: Fri Apr 10 19:46:36 2020 +0000

    Handle entrypoint is None

    Change-Id: Ic6eb27cb018eec6d476fbbe17f29ac020ce83b71
    Closes-Bug: #1872130

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ussuri
Review: https://review.opendev.org/719112

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/719112
Committed: https://git.openstack.org/cgit/openstack/python-zunclient/commit/?id=d26adc61c0afbc5e6eaae5108200fef8e8c7185b
Submitter: Zuul
Branch: stable/ussuri

commit d26adc61c0afbc5e6eaae5108200fef8e8c7185b
Author: Hongbin Lu <email address hidden>
Date: Fri Apr 10 19:46:36 2020 +0000

    Handle entrypoint is None

    Change-Id: Ic6eb27cb018eec6d476fbbe17f29ac020ce83b71
    Closes-Bug: #1872130
    (cherry picked from commit 75d2d10a8159f89b60a6366a326b5183cd33e926)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/python-zunclient 4.0.1 release.