The Dot Hill driver is no longer supported by an independent CI, so
the driver was marked unsupported in the Ocata release, and is being
disabled in Pike. The driver code remains in place since it's
subclassed by other drivers (lenovo, hpmsa), but attempting to load
the dothill driver will throw an exception.
DocImpact: Remove description of Dot Hill AssuredSAN driver
UpgradeImpact: Dot Hill storage requires configuration of a new driver.
Change-Id: Ic2cec24ac33813cbce4c3166cc04f32ad3df6396