sosreport fails during collectting container logs

Issue

• When container_log plugin and --all-logs flag are enabled, sosreport fails with the following error:

  Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/sos/sosreport.py", line 964, in setup
    plug.setup()
  File "/usr/lib/python2.7/site-packages/sos/plugins/container_log.py", line 24, in setup
    self.add_copy_spec(logdir)
  NameError: global name 'logdir' is not defined