Bazel support for ONOS applications and OAR files

Change-Id: Ic938dded82a68aa75d5f5df18363f3127a36d1ef
diff --git a/tools/build_rules/prelude_bazel b/tools/build_rules/prelude_bazel
index 11451e0..8695c9a 100644
--- a/tools/build_rules/prelude_bazel
+++ b/tools/build_rules/prelude_bazel
@@ -13,5 +13,6 @@
     "generated_java_libraries",
 )
 load("//tools/build/bazel:osgi_java_library.bzl", "osgi_jar", "osgi_jar_with_tests")
+load("//tools/build/bazel:onos_app.bzl", "onos_app")
 
 generated_java_libraries()