rook: rabbitmq not binding to block storage

Bug Report

What happened: rabbitmq failed with: PersistentVolumeClaim is not bound: “rabbitmq-rabbitmq” (repeated 5 times)

What you expected to happen: rabbit to start sucessfully

How to reproduce it (minimal and precise):

Create AKS cluster 1.8.2 on Azure, 5 node, 300GB SSD OS Drive

helm install --name rook --namespace rook-system rook-master/rook --set rbacEnable=false
kubectl create -f rook-cluster.yaml
kubectl create -f rook-storageclass.yaml
helm install --name rabbitmq --set persistence.storageClass=rook-block stable/rabbitmq

Logs

root@rook-tools:/# ceph status
  cluster:
    id:     c3628414-b9f4-46f8-8bd8-9648d45e0435
    health: HEALTH_OK

  services:
    mon: 3 daemons, quorum rook-ceph-mon1,rook-ceph-mon2,rook-ceph-mon0
    mgr: rook-ceph-mgr0(active), standbys: rook-ceph-mgr1
    osd: 5 osds: 5 up, 5 in

  data:
    pools:   1 pools, 100 pgs
    objects: 1 objects, 8 bytes
    usage:   105 GB used, 1448 GB / 1553 GB avail
    pgs:     100 active+clean

root@rook-tools:/# rookctl status
OVERALL STATUS: OK

USAGE:
TOTAL      USED         DATA      AVAILABLE
1.52 TiB   105.03 GiB   8 B       1.41 TiB

MONITORS:
NAME             ADDRESS               IN QUORUM   STATUS
rook-ceph-mon1   10.0.85.215:6790/0    true        OK
rook-ceph-mon2   10.0.131.231:6790/0   true        OK
rook-ceph-mon0   10.0.253.167:6790/0   true        OK

MGRs:
NAME             STATUS
rook-ceph-mgr0   Active
rook-ceph-mgr1   Standby

OSDs:
TOTAL     UP        IN        FULL      NEAR FULL
5         5         5         false     false

PLACEMENT GROUPS (100 total):
STATE          COUNT
active+clean   100