"os-volume-type-access:is_public" property is the
same as "is_public" property in volume type object.
So stop showing "os-volume-type-access:is_public"
property and leave "is_public" property only.
Change-Id: Ic78a9ee69b0ab356edff18cdb4c46fc24b495d2b
Closes-Bug: #1620922