Add libvirt XML schema support for resource tuning parameters
Add libvirt XML schema support for resource tuning parameters

Extend the libvirt XML config classes to support for CPU, disk IO,
network traffic tuning parameters.

Blueprint: quota-instance-resource
DocImpact
original reviews https://review.openstack.org/#/c/14151/

Change-Id: I2827ea0e731fefe5bbaec6c385268a3f5b89f7f6

n0ano/ganttclient