Create script to automatically set up a new batch account

[martintoreilly]

Acceptance criteria

Batch account is set up with no user interaction except authentication

• [x] Assigns a random identifier to use for the name of all components
• [x] Creates a resource group
• [x] Creates a batch account
• [x] Creates a storage account and links it to the batch account

Notes

• Borrow functionality from the Azure CLI 2.0 client. Note that the the Azure CLI 2.0 client is a Python app. To access the azure-cli modules, install them using pip install azure-cli. This will also install the CLI client itself, which can be run using the az command.
• We will also need to install the matching v2.0 azure libraries. To do this, run pip install --pre azure (the --pre is required as v2.0 is still in pre-release). If you have already installed the non-preview v1.0 azure libraries, you will need to uninstall these using pip uninstall azure (you can check the version you have installed by running pip freeze.
• Copy the functionality in this sample bash script from Microsoft.
• Azure storage account names are limited to 24 character lower case + numbers, so we cannot use UUIDs for our random identifiers, as these are 32 characters even without hyphens. Use ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.digits) for _ in range(N)) (see Stack Overflow).
• Authentication is handled by the Azure CLU app (az login), so we can use this rather than implement it in the script itself.

[martintoreilly]

Done in commit 50abf93