Deprecate usage of `docker.io/ibmcom`

[prb112]

Deprecate usage of docker.io/ibmcom

ansible-bastion/playbooks/roles/services/tasks/setup_registry.yaml:132:    shell: "/usr/local/bin/oc image mirror docker.io/ibmcom/nfs-client-provisioner-ppc64le:latest registry.{{ dns.clusterid }}.{{ dns.domain }}:5000/nfs-client-provisioner-ppc64le:latest -a {{ pull_secret_file }}-updated"
ansible-bastion/playbooks/defaults/main.yaml:93:  registry_image: docker.io/ibmcom/registry-ppc64le:2.6.2.5
ansible-bastion/docs/vars-doc.md:274:  registry_image: docker.io/ibmcom/registry-ppc64le:2.6.2.5
tf-powervc/docs/var.tfvars-doc.md:198:local_registry_image       = "docker.io/ibmcom/registry-ppc64le:2.6.2.5"
tf-powervc/var.tfvars:74:#local_registry_image       = "docker.io/ibmcom/registry-ppc64le:2.6.2.5"
tf-powervc/variables.tf:458:  default     = "docker.io/ibmcom/registry-ppc64le:2.6.2.5"
tf-powervs/docs/var.tfvars-doc.md:270:local_registry_image       = "docker.io/ibmcom/registry-ppc64le:2.6.2.5"
tf-powervs/var.tfvars:90:#local_registry_image       = "docker.io/ibmcom/registry-ppc64le:2.6.2.5"
tf-powervs/variables.tf:585:  default     = "docker.io/ibmcom/registry-ppc64le:2.6.2.5"