Persist zone object properties option

Add functions to set and get persisted properties on a zone by the
interface and property name. When a property exists, it is persisted
each time it is updated.

Tested:
    Current property is added and persisted.
    When Current property not added, it is not persisted.

Change-Id: I2540c3673affcda871c9342cad44e85a4510d756
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
2 files changed