[Pure Storage] Add support for per GB backend QoS

Registered by Simon Dodsley

Add support for per GB QoS setting for volumes.
Add two new parameters for extra-specs - maxBWS_per_GB and maxIOPS_per_GB
These will be used to set the actual qoS setting for a volume based on its actual volume size.
Ensure that these settings are dynamically altered during a volume extend and also apply as necessary when managing existing volumes.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
Simon Dodsley
Direction:
Needs approval
Assignee:
Simon Dodsley
Definition:
Approved
Series goal:
None
Implementation:
Not started
Milestone target:
None

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