Uploading RPM's to a custom repository fails with `PLP0047: The importer yum_importer indicated a failed response when uploading rpm unit to repository Custom_Packages_for_RHEL7_x86_64.`

Issue

• Uploading RPM packages to a custom repository using hammer command fails with the below error:

  "Traceback (most recent call last):\n  File \"/usr/lib/python2.7/site-packages/celery/app/trace.py\", line 240, in trace_task\n    R = retval = fun(*args, **kwargs)\n  File \"/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py\", line 473, in __call__\n    return super(Task, self).__call__(*args, **kwargs)\n  File \"/usr/lib/python2.7/site-packages/pulp/server/async/tasks.py\", line 103, in __call__\n    return super(PulpTask, self).__call__(*args, **kwargs)\n  File \"/usr/lib/python2.7/site-packages/celery/app/trace.py\", line 437, in __protected_call__\n    return self.run(*args, **kwargs)\n  File \"/usr/lib/python2.7/site-packages/pulp/server/managers/content/upload.py\", line 223, in import_uploaded_unit\n    unit_type=unit_type_id, summary=result['summary'], details=result['details']\nPulpCodedException: The importer yum_importer indicated a failed response when uploading rpm unit to repository Custom_Packages_for_RHEL7_x86_64.\n"
  
  Katello::Errors::PulpError:  PLP0047: The importer yum_importer indicated a failed response when uploading rpm unit to repository Custom_Packages_for_RHEL7_x86_64.