yang app changes for karaf 4.2.1 CLI

Change-Id: I64faeee437184de8a277f611b02ae50dd3df654a
diff --git a/apps/yang/BUILD b/apps/yang/BUILD
index 1f38d13..12decaf 100644
--- a/apps/yang/BUILD
+++ b/apps/yang/BUILD
@@ -14,6 +14,7 @@
 ]
 
 osgi_jar_with_tests(
+    karaf_command_packages = ["org.onosproject.yang.impl"],
     deps = COMPILE_DEPS,
 )