Throw DBusPropertyError for all property accesses

On all get/set property functions, when an error occurs performing the
access of a property, throw a DBusPropertyError exception containing the
identifying parameters of the property.

Tested:
    DBusPropertyError exception occurs on failing to set a property
    DBusPropertyError exception occurs on failing to get a property

Change-Id: I9882d62d75153b4320a8d4a21ba7a52efbdd0af2
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
2 files changed