k8s_exec: Update deprecation warning
SUMMARY
return_code is deprecated in favor of rc, update the
deprecation warning to tell user about the reason behind
this.
Fixes: #417
Signed-off-by: Abhijeet Kasurde akasurde@redhat.com
ISSUE TYPE
Bugfix Pull Request
COMPONENT NAME
changelogs/fragments/417_deprecation.yml
plugins/modules/k8s_exec.py
Reviewed-by: Mike Graves <mgraves@redhat.com>
