Comment 0 for bug 1850040

What happened:
Since muranodashboard-cache is stored by Horizon container in /tmp (needs to be some space to upload images)this can be deleted by another proccess.
This cause some type of "corrupted" interface that doesn't allow you to choose any app.

This can be solved by executing
docker exec -tiu horizon horizon mkdir -p /tmp/muranodashboard-cache/apps
on affected controllers but is not a real solution when.

What you expected to happen:
Since user horizon is able to write on /tmp and this data is cache stored on /tmp it should be recreated by horizon without help.

Environment:
OS: Centos7
Kolla-Ansible version 7.1.2
Docker image Install type: binary
Docker image distribution: Centos (From Docker Hub)