SDFAB-998 Move omec-user-plane from aether-helm-chart to sdfabric-helm-chart

It is renamed to bess-upf.
The license is also updated to Apache 2.0.
We also remove omec-upf-cni which is no longer in use.

Change-Id: Ie9ce877c13203a76bf90d24918734ded33587157
diff --git a/bess-upf/.gitignore b/bess-upf/.gitignore
new file mode 100644
index 0000000..616ae1a
--- /dev/null
+++ b/bess-upf/.gitignore
@@ -0,0 +1,5 @@
+# SPDX-FileCopyrightText: 2020-present Open Networking Foundation <info@opennetworking.org>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+charts/