Manila has "share types", analogous to Cinder "volume types", that
may contain qualified extra-specs - extra-specs that have significance
only for the backend driver and which are not reported back to the
scheduler.
This commit adds the following boolean qualified extra-specs:
* netapp:dedup
* netapp:compression
alongside preexisting support for the netapp:thin_provisioned boolean
qualified extra spec.
Implements blueprint more-cdot-qualified-specs
Change-Id: Ief1da9019165f60bf191b80c069a1e9bd7c34168