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This adds console_utils functions for 'socat' console. Implements: - get_socat_console_url(): returns url for socat console - start_socat_console(): uses (socat + console_cmd execution) - stop_socat_console(): stops socat/console_cmd subprocess Change-Id: I79ddd83d12cc8111e05b5107359d6db8a8881d61 Spec: https://review.openstack.org/#/c/319505/ Related-Bug: #1553083