Added two charts for Number of Volumes and Total Volume Storage quotas
on Python launch instance modal when cinder is enabled.
The charts reflect the volume usage of the new instances to be created
as the user changes the configuration on the modal.
Change-Id: I68a88cc867dd36f3d29cd77c1825858f86f3713f
Partially-implements: blueprint launch-instance-volume-quotas
72af3cf96e