Implement L2 load balancing service

Including event/listener, CLI support

Change-Id: I26f1da578a72f5b3ead413aa5155233fbf9ab2b6
diff --git a/apps/l2lb/BUILD b/apps/l2lb/BUILD
new file mode 100644
index 0000000..7209251
--- /dev/null
+++ b/apps/l2lb/BUILD
@@ -0,0 +1,18 @@
+COMPILE_DEPS = CORE_DEPS + KRYO + CLI + [
+    "//core/store/serializers:onos-core-serializers",
+]
+
+TEST_DEPS = TEST_ADAPTERS
+
+osgi_jar_with_tests(
+    test_deps = TEST_DEPS,
+    deps = COMPILE_DEPS,
+)
+
+onos_app(
+    app_name = "org.onosproject.l2lb",
+    category = "Utilities",
+    description = "L2 Load Balance Service",
+    title = "L2 Load Balance Service",
+    url = "http://onosproject.org",
+)