Couchbase On Ubuntu - Not All Parameters Used In Deploy

[couchbase-on-ubuntu](https://github.com/Azure/azure-quickstart-templates/tree/master/couchbase-on-ubuntu)
### Issue Details

azuredeploy.json template does not use parameters `storageAccountNamePrefix` and `clusterName` in deployment.
### Repro steps
1. Specify "Storage account name" in template in Azure Portal
2. Specify "The name of the Couchbase cluster" in template in Azure Portal
3. Select other options
4. Complete Legal Terms
5. Deploy
6. Get Failure in pre-flight checks similar to "The storage account cbstorage0 is already taken"

Start in couchbase-on-ubuntu/azuredeploy.json and inspect how the storageAccountNamePrefix and clusterName parameters are used during deployment. Reproduce the Azure Portal deployment with those values, then verify the template uses them and no longer fails pre-flight checks because the storage account name is already taken.

Written by the indexing model from the issue text.