Moving junit out of core.jar and into core-junit.jar.

Patched from master.
https://android-git.corp.google.com/g/50609

Change-Id: Idbcebbd3ba3599234cf9615b4cf3d38e99d2983f
diff --git a/rootdir/init.rc b/rootdir/init.rc
index 63769f5..576b4f8 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -14,7 +14,7 @@
     export ANDROID_DATA /data
     export EXTERNAL_STORAGE /mnt/sdcard
     export ASEC_MOUNTPOINT /mnt/asec
-    export BOOTCLASSPATH /system/framework/core.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar
+    export BOOTCLASSPATH /system/framework/core.jar:/system/framework/ext.jar:/system/framework/framework.jar:/system/framework/android.policy.jar:/system/framework/services.jar:/system/framework/core-junit.jar
 
 # Backward compatibility
     symlink /system/etc /etc