Open Stack

This is a notice to any out of tree virt driver implementors of the 
ComputeDriver.update_provider_tree() interface that they now need to set 
the allocation_ratio and reserved amounts for VCPU, MEMORY_MB and 
DISK_GB inventory from the update_provider_tree() method assuming [1] 
merges. The patch below that one in the series shows how it's 
implemented for the libvirt driver.

[1] https://review.openstack.org/#/c/613991/

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Thanks,

Matt