need to update all other modules to follow @privateip contribution on issue #7

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.

Best practices are documented here

• rename modules to include .py extension and add __init__.py
• add RETURNS docstring
• add Github handle to author
• update version_added string to "2.3"
• catch import errors and return helpful string
• add __name__ == `__main__': check
• swap docstring and imports