Subscription support filtering tags for zaqar

The current subscription does not support message filtering, so when a subscriber subscribes to a topic, all messages which sent to the topic will be sent to the subscriber, which will be a lot less flexible and strategic. So I'm suggest that the 'Subscription Filtering Tags' feature is intended to solve the proble...

Implement a new qos instead of the flavor-qos based libvirt driver. for OpenStack Compute (nova)

Now the 'flavor-qos' has limitation, when the instance be created, we can never modify the qos value. So we need a new api to modify the instances qos live. The qos api should include the network bandwidth qos, disk iops and cpu quota, etc.