Framework : Long press kill fixes

Jellybean introduced changes to systemui's privelege level.
This patch hardcodes a check to avoid killing it.

Patchset 2 : Minor fix
Patchset 3 : Check length of pkgList rather than apps
Patchset 4 : Vibrate on kill

Change-Id: I24af510a62cae9acc29504912fb133825bb67bb6