This patch adds a shim LibvirtScaleIOVolumeDriver calling the os-brick
library.
Both ScaleIO Cinder driver and ScaleIO connector driver in os-brick
were merged. The connector driver is available in os-brick 0.3.0
and later.
implements blueprint emc-sdc-libvirt-volume-driver
Change-Id: If2bba1f9d4c2ddfad7a26ca74bb61fe9ed6684ba