Red Hat Satellite 6.7 shows "no implicit conversion of Array into String (TypeError)" when provisioning or using remote execution

Issue

• Remote execution jobs fail with below error after upgrade to Red Hat Satellite 6.7 version:

          no implicit conversion of Array into String (TypeError)
          /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_remote_execution-2.0.10/app/models/concerns/foreman_remote_execution/host_extensions.rb:54:in `+'
          /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_remote_execution-2.0.10/app/models/concerns/foreman_remote_execution/host_extensions.rb:54:in `host_params_hash'
          /usr/share/foreman/app/models/concerns/host_params.rb:54:in `host_params'
          /usr/share/foreman/app/models/concerns/host_params.rb:11:in `params'
          /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_ansible-4.0.3.5/app/models/foreman_ansible/ansible_provider.rb:54:in `host_setting'
  

• After upgrading to Red Hat Satellite 6.7, provisioning fails with:-

  Templates
  Failure parsing Kickstart default PXELinux VLAN: no implicit conversion of Array into String.
  Failure parsing Kickstart default PXEGrub: no implicit conversion of Array into String.