Red Hat Satellite 6 pulp_streamer.service fails with /usr/lib/python2.7/site-packages/pkg_resources.py pkg_resources.DistributionNotFound

Issue

• pulp_streamer service is not starting on Red Hat Satellite server.

  pulp_streamer.service - The Pulp lazy content loading streamer
    Loaded: loaded (/usr/lib/systemd/system/pulp_streamer.service;    enabled; vendor preset: disabled)
    Active: failed (Result: exit-code) since Wed 2021-07-21 08:22:11 +11; 38min ago
   Process: 10314 ExecStart=/usr/bin/pulp_streamer --nodaemon --syslog --prefix=pulp_streamer --pidfile= --python       /usr/share/pulp/wsgi/streamer.tac (code=exited, status=1/FAILURE)
  Main PID: 10314 (code=exited, status=1/FAILURE)
  
  satellite.example.com pulp_streamer[10314]: File "/usr/bin/pulp_streamer", line 5, in <module>
  satellite.example.com pulp_streamer[10314]: from pkg_resources import load_entry_point
  satellite.example.com pulp_streamer[10314]: File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 3011, in <module>
  satellite.example.com pulp_streamer[10314]: parse_requirements(__requires__), Environment()
  satellite.example.com pulp_streamer[10314]: File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 626, in resolve
  satellite.example.com pulp_streamer[10314]: raise DistributionNotFound(req)
  satellite.example.com pulp_streamer[10314]: pkg_resources.DistributionNotFound: urllib3>=1.21.1,<1.24
  satellite.example.com systemd[1]: pulp_streamer.service: main process exited, code=exited, status=1/FAILURE
  satellite.example.com systemd[1]: Unit pulp_streamer.service entered failed state.
  satellite.example.com systemd[1]: pulp_streamer.service failed.