eliminate the need for hp3parclient in tests

In order to eliminate the need to have the hp3parclient in the
global-requirements project, we need to remove the hp3parclient
from being imported in all 3par driver unit tests in cinder.

Closes-Bug: #1315195
Change-Id: Ife5c70871e742be5970be8f0284e12554f93cab4
Merge "eliminate the need for hp3parclient in tests"
Convert SolidFire Capacity response to GiB

This patch fixes the reported free_capacity_gb response
in the SolidFire update_cluster_status method.

The initial patch fixed the free_capacity conversion,
however omitted the same fix that was needed for the
free_space calculation.

Closes Bug: #1284452

Change-Id: If034957764911ec92a6d7e603d0510325018db6d