List storage accounts within the subscription.

def list_storage_accounts(call=None):
    '''
    List storage accounts within the subscription.
    '''
    if call == 'action':
        raise SaltCloudSystemExit(
            'The list_storage_accounts function must be called with '
            '-f or --function'
        )

    storconn = get_conn(client_type='storage')

    ret = {}
    try:
        accounts_query = storconn.storage_accounts.list()
        accounts = __utils__['azurearm.paged_object_to_list'](accounts_query)
        for account in accounts:
            ret[account['name']] = account
    except CloudError as exc:
        __utils__['azurearm.log_cloud_error']('storage', exc.message)
        ret = {'Error': exc.message}

    return ret