frameworks: Hope systemui improved battery life

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

Remove KeyguardTestActivity

Change-Id: I3395d64abba87d5002bbc08af62c45dcc9e75015

Conflicts:
	packages/Keyguard/test/res/drawable-hdpi/app_icon.png
	packages/Keyguard/test/res/drawable-mdpi/app_icon.png
	packages/Keyguard/test/res/drawable-xhdpi/app_icon.png