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Required to make the successful execution of the CTT test case
which expects observe notification from DevConf.
As DevConf is a read-only resource, it is not possible to update its
properties and hence there can't be any observe notifications.
So this change makes DevConf non-observable.

Change-Id: I8c73865aa995a61729e41063dfa0a74d0bea1400
Signed-off-by: Senthil Kumar G S <senthil.gs@samsung.com>