Bootstrap renewal of kerberos keys for Azure Storage should be optional

[doherty100]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [ X ] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

Run terraform-azurerm-vnet-shared\bootstrap.sh

Any log messages given by the failure

Creating kerberos key for storage account 'STORAGE-ACCOUNT-NAME'...

Expected/desired behavior

Bootstrap should make renewal of kerberos key optional

OS and Version?

N/A

Versions

AzureSandbox v2.10.1

Mention any other details that might be useful

Bootstrap.sh should be idempotent. This change will enable idepotency.