Provide logdog for cat haters

Make additional logcat symlinks:
- logdog
- loldog

Also provide adb shortcuts:
- adb logdog
- adb loldog
- adb longdog

Change-Id: I99635da7615fe183bf4eca380945cb8a7cee3cfa

Conflicts:
	logcat/Android.mk
Expose /dev/hw_random to group "system".

This is needed to let EntropyMixer (runs inside system_server) read
from /dev/hw_random.

Change-Id: Ifde851004301ffd41b2189151a64a0c5989c630f