Azure file storage is not used when configured

[gondoi]

Issue

When using install-pcf on Azure from the master branch, defining azure_storage_account_name as suggested in the params comments, does not actually configure the PAS tile to use Azure storage and defaults to internal (NFS).
This is with both 2.1 and 2.2 that I have tested.

Context

Defining this gives the expectation that the storage accounts created will be configured and used. Although, NFS is created and used and if this storage option is used, blobstore migration will have to be performed in order to switch.

Expected result

Use the storage type defined.

Current result

The option is ignored and internal storage is used.

Steps to Reproduce

Define, run pipeline, and review settings in PAS for file storage.

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[gondoi]

I found that internal storage is hard coded in the task, so providing a value in the params file does nothing:

https://github.com/pivotal-cf/pcf-pipelines/blob/master/tasks/config-ert/task.sh#L170-L173