Refactor buck external dependencies

Change-Id: Ia4b99493407eb7d4e893804cba6b944f758f085e
diff --git a/apps/iptopology-api/BUCK b/apps/iptopology-api/BUCK
index 3cc9301..9661e11 100644
--- a/apps/iptopology-api/BUCK
+++ b/apps/iptopology-api/BUCK
@@ -1,5 +1,6 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//lib:joda-time',
 ]
 
 osgi_jar_with_tests (