add uiautomator into system image

this includes 2 pieces:
* uiautomator shell script
* uiautomator.jar: test runner and the automation framework
  classes

source is under frameworks/testing/uiautomator

Change-Id: I237d85b8917d2451cf35362d2e34786940897921

target/product/core.mk

@@ -118,7 +118,8 @@ PRODUCT_PACKAGES := \
     requestsync \
     screencap \
     sensorservice \
-    lint
+    lint \
+    uiautomator
 
 PRODUCT_COPY_FILES += \
     system/core/rootdir/init.usb.rc:root/init.usb.rc \