Sent Fail notification disappears from notification panel if launching email app

Sent Fail notification disappears from notification panel if launching email app

[Problem] "Sent Fail" notification disappears from notification panel if launching email app
[Cause & Measure] Cause: emcore_clear_notification() is called if email app is launched, then email-service removes all notification unconditionally.
Measure: set noti type when inserting notification, and classify the sent fail notification when emcore_clear_notification is called.

Change-Id: I6ddd96ff6259356160ccc4e733fba7cc22190105
Signed-off-by: intae, jeon <intae.jeon@samsung.com>