[VOL-1615] Create VOLTHA 2.0 Helm Charts

Squashed version of David Bainbridge's patches at commit:

 https://github.com/ciena/voltha-helm-charts/commit/120fb4b719e0492e6a0a24cc78d08b806e3698fa

Linted the README, fixed whitespace and incubator repo address

Change-Id: I7c5b1c3478450bbefbed09a75e9029e6371cae3a
diff --git a/voltha-etcd-cluster/templates/etcd-cluster.yaml b/voltha-etcd-cluster/templates/etcd-cluster.yaml
new file mode 100644
index 0000000..7939a39
--- /dev/null
+++ b/voltha-etcd-cluster/templates/etcd-cluster.yaml
@@ -0,0 +1,30 @@
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: "etcd.database.coreos.com/v1beta2"
+kind: "EtcdCluster"
+metadata:
+  name: {{ quote .Values.clusterName }}
+spec:
+  size: {{ .Values.clusterSize }}
+  pod:
+    resources:
+      limits:
+        memory: {{ .Values.memoryLimit }}
+    etcdEnv:
+    - name: ETCD_AUTO_COMPACTION_RETENTION
+      value: {{ quote .Values.autoCompactionRetention }}
+    busyboxImage: {{ .Values.registry }}{{ .Values.images.busybox.repository }}:{{ tpl .Values.images.busybox.tag . }}
+  version: {{ tpl .Values.images.etcd.tag . }}
+  repository: {{ .Values.registry }}{{ .Values.images.etcd.repository }}