Issue
    Provisiong is failing when we have multiple webui host
    HA enable for ceph rest api IP
    Changed Variable name storage-master-ip to storage-rest-api
Fix:
    Removed the for loop to get all webui host name, it will be taken care the @task framework
    If HA is enable get the cinder vip IP or storage master ip and set to storage-rest-api.

Closes Bug: 1386446

Change-Id: I9e26cf43e6417cad43b4d9a144019f3f886dccb4