Change webeos deployment volume so it doesn't use PVC
We do not have currently a eos volume provisioned in Openshift 4 because we use CM's eosxd chart https://gitlab.cern.ch/helm/charts/cern/-/tree/master/eosxd deploying https://gitlab.cern.ch/cloud/eosd
As per the doc we need to mount the hostPath directly in the pod without a PVC
This means that we need a SCC for the webeos serviceaccount that corresponds to hostmount-anyuid
default SCC. (see cephfs-csi deployment for how this is done)