+ """
+ Common code for get_net and new_net. It looks for a network on VIM with the filter_params
+ :param task: task for this find or find-or-create action
+ :param filter_param: parameters to send to the vimconnector
+ :return: a dict with the content to update the instance_nets database table. Raises an exception on error, or
+ when network is not found or found more than one
+ """