Refactor buck external dependencies

Change-Id: Ia4b99493407eb7d4e893804cba6b944f758f085e
diff --git a/utils/rest/BUCK b/utils/rest/BUCK
index 7b08a5e..2d7885b 100644
--- a/utils/rest/BUCK
+++ b/utils/rest/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:COMPILE',
+    '//lib:JACKSON',
     '//utils/osgi:onlab-osgi',
     '//utils/misc:onlab-misc',
     '//lib:javax.ws.rs-api',