Settings: Remove lockscreen options from security.

  - Create a separate fragment for Lockscreen settings
  - Move App Security up in Security Settings
  - General clean up

@cristianomatos: move PIN keypad shuffler and gesture based lockscreen either

Change-Id: I4dc20942b87c2446c7e798e28f7e475efebaddb8

Conflicts:
	src/com/android/settings/SecuritySettings.java

Conflicts:
	res/xml/security_settings_chooser.xml
	src/com/android/settings/SecuritySettings.java