Container resize needs resource claiming in compute node

Currently, we allow users to update the 'cpu' and 'memory' of the container but we don't check if the host has enough resources for this update. As a result, the container might take more resources than available.

We should perform resource checking while updating the container (similar as when we create the container), each update request should go through resource_tracker and do resource claiming (https://github.com/openstack/zun/blob/master/zun/compute/claims.py) in the compute node, which ensure the host has enough resources.

NOTE: This is how we do resource claiming when creating container: https://review.openstack.org/#/c/463638/11/zun/compute/manager.py