Upgrade to Red Hat Ansible Tower 3.8.5 fails with an error `Error in PREIN scriptlet in rpm package ansible-tower-venv-ansible-3.8.5-2.el7at.x86_64` on RHEL7

Issue

• Ansible Tower fails when trying to install ansible-tower-venv-ansible RPM package:

  [...SNIP...]
  TASK [packages_el : Install the Tower RPM.]                                                              
  **********************************************************************************************************************************
  fatal: [localhost]: FAILED! => {"changed": true, "changes": {"installed": ["ansible-tower = 3.8.5"], "updated": []}, "msg": "Error in PREIN scriptlet in  rpm package ansible-tower-venv-ansible-3.8.5-2.el7at.x86_64\nansible-tower-venv-ansible-3.8.4-1.el7at.x86_64 was  supposed to be removed  but is not!\n"
  [...SNIP...]