Sample to show how to get server console url

The simple sample is used to show how to use `console_urls` attribute
of OS::Nova::Server resource.

Change-Id: I2975e7f3faedba977d83eef654c2c992c2eda109
Implements: blueprint vnc-console-attr
Co-Authored-By: Pavlo Shchelokovskyy <pshchelokovskyy@mirantis.com>
Merge "Sample to show how to get server console url"