Update roscore to have separate dns and use official ros

Change-Id: Ifb28800bfaba66907ab8178caad5e229d484d848
diff --git a/apps/ros-core/requirements.yaml b/apps/ros-core/requirements.yaml
new file mode 100644
index 0000000..98f7209
--- /dev/null
+++ b/apps/ros-core/requirements.yaml
@@ -0,0 +1,9 @@
+# Copyright 2019-present Open Networking Foundation
+#
+# SPDX-License-Identifier: LicenseRef-ONF-Member-Only-1.0
+
+dependencies:
+  - name: coredns
+    version: 1.13.4
+    repository: https://charts.helm.sh/stable
+    condition: coredns.deploy