Establish connection to Azure service.

def conn_az(cred, crid):
    """Establish connection to Azure service."""
    driver = get_driver(Provider.AZURE_ARM)
    try:
        az_obj = driver(tenant_id=cred['az_tenant_id'],
                        subscription_id=cred['az_sub_id'],
                        key=cred['az_app_id'],
                        secret=cred['az_app_sec'])
    except SSLError as e:
        abort_err("\r SSL Error with Azure: {}".format(e))
    except InvalidCredsError as e:
        abort_err("\r Error with Azure Credentials: {}".format(e))
    return {crid: az_obj}