Lockscreen Notifications: try to fix occasionally SystemUI FC on boot

Change-Id: I3ede8f31cfdd70eb0cf1285e6c9c8002d95caa69
frameworks: Hope systemui improved battery life

See this:
http://image.thinkingbridge.org/keyguard.png

Remove KeyguardTestActivity

Change-Id: I3395d64abba87d5002bbc08af62c45dcc9e75015