Description of problem:
With ansible-runner there is no partial success as is with ansible-playbook.
if ansible REX job fails for one host the other hosts are marked as failed too even though job succeeded for them.

Version-Release number of selected component (if applicable):
@Satellite-6.6.0 Snap9
tfm-rubygem-foreman_ansible-3.0.3-3.el7sat.noarch
tfm-rubygem-foreman_ansible_core-3.0.0-1.el7sat.noarch
rubygem-smart_proxy_ansible-3.0.1-1.el7sat.noarch
ansible-runner-1.3.4-2.el7ar.noarch
ansible-2.8.2-1.el7ae.noarch

How reproducible:
deterministic

Steps to Reproduce:
1. Have Satellite and two hosts set up for REX using ansible-runner

# yum install ansible-runner
# hammer settings set --name ansible_implementation --value ansible-runner

2. On 1st host create a dir while on latter it doesn't exist

@host # mkdir /tmp/foo

3. Run Ansible Command job against the two hosts with command "cd /tmp/foo"

-------------
   1:
   2:PLAY [all] *********************************************************************
   3:
   4:TASK [Gathering Facts] *********************************************************
   5:ok: [host1.example.com]
   6:
   7:TASK [shell] *******************************************************************
   8:changed: [host1.example.com]
   9:
  10:TASK [debug] *******************************************************************
  11:ok: [host1.example.com] => {
  12:    "out": {
  13:        "changed": true, 
  14:        "cmd": "cd /tmp/foo\n", 
  15:        "delta": "0:00:00.005329", 
  16:        "end": "2019-07-16 08:49:49.585670", 
  17:        "failed": false, 
  18:        "rc": 0, 
  19:        "start": "2019-07-16 08:49:49.580341", 
  20:        "stderr": "", 
  21:        "stderr_lines": [], 
  22:        "stdout": "", 
  23:        "stdout_lines": []
  24:    }
  25:}
  26:PLAY RECAP *********************************************************************
  27:host1.example.com : ok=3    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
  28:Exit status: 2
-------------
   1:
   2:PLAY [all] *********************************************************************
   3:
   4:TASK [Gathering Facts] *********************************************************
   5:ok: [host2.example.com]
   6:
   7:TASK [shell] *******************************************************************
   8:fatal: [host2.example.com]: FAILED! => {"changed": true, "cmd": "cd /tmp/foo\n", "delta": "0:00:00.004742", "end": "2019-07-16 08:49:49.584202", "msg": "non-zero return code", "rc": 1, "start": "2019-07-16 08:49:49.579460", "stderr": "/bin/sh: line 0: cd: /tmp/foo: No such file or directory", "stderr_lines": ["/bin/sh: line 0: cd: /tmp/foo: No such file or directory"], "stdout": "", "stdout_lines": []}
   9:
  10:TASK [debug] *******************************************************************
  11:PLAY RECAP *********************************************************************
  12:host2.example.com : ok=1    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0
  13:Exit status: 2
-------------


Actual results:
100% Failure  (if 1 host fails then all hosts fail)

Expected results:
50% Success (failure of 1 host doesn't prevent other hosts to be successful)