Add: Add test keypad code, and prepare log sys
Modify: do some test in key_loop
Squashed commit of the following:

commit d95f5db0126700ed169fd68e867d2d6d2a97047c
Author: clydewu <claudwu@gmail.com>
Date:   Tue Nov 26 21:09:54 2013 +0800

    Modify: Solve keypad failure problem

commit 6b2e198a334dfb2c416c1489b8051e919f5e34e1
Author: clydewu <claudwu@gmail.com>
Date:   Sat Nov 23 02:40:12 2013 +0800

    Modify: Disabled syn_keypad_thr, and other thread for test
Modify: I don't know when be modified... XD
TEST: Test for use ssh-key commit