Guard NPatchData removal case during signal emit

Guard NPatchData removal case during signal emit

It was possible that NPatchData removed during NotifyObserver.
For more safety, let we make NPatchData as shared_ptr, instead
of unique_ptr.

And also, let we don't touch observer list container during
NotifyObservers.

And also, let we remove NPatchInfo at post processing.
It will keep the life of NPatchData during NotifyObserver try to
remove the NPatchInfo.

Change-Id: Ieca33a2231df38d23966f96593506d67333cfcd0
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>