I have got the same dialog box as per post #18.
Resolved by using an app to control App Ops (versions 4.3 - 4.4.1). Search App Ops on Play Store. For my Samsung S3, an app called Permission Manager install perfectly.
From there you can swipe across to apps running. See Knox. Then untoggle the notification setting. Works a charm.
Thus permission manager app is also useful for removing any permissions from individual apps. For me I want location services on for mapping etc. But off for Facebook posts. Using permission manager, I now have that granularity
Hope this works for you