aos_blueprint_virtnet - handle update use-case

[jeremyschulman]

currently if the User is not able to update an existing virtual-network. when the module is run, it checks for the virtual-network existence, and simply returns changed=False.

we need to handle the use case to update an existing virtual-network. but then also need to check to see if changed is True or False depending on the values.

marking this as a bug because the User expects that if they are providing different information for an existing virtual-network, the module should actually do the update.