Add AppDB multi-cluster sample (#262)

Author: irajdeep

samples/appdb_multicluster/ops-manager-multi-cluster-appdb.yaml

@@ -0,0 +1,44 @@
+apiVersion: mongodb.com/v1
+kind: MongoDBOpsManager
+metadata:
+  name: <myopsmanager>
+spec:
+  replicas: 1
+  version: <opsmanagerversion>
+  adminCredentials: <adminusercredentials> # Should match metadata.name
+                                           # in the Kubernetes secret
+                                           # for the admin user
+
+  externalConnectivity:
+    type: LoadBalancer
+  security:
+      certsSecretPrefix: <prefix> # Required. Text to prefix
+                                  # the name of the secret that contains
+                                  # Ops Manager's TLS certificate.
+      tls:
+        ca: "om-http-cert-ca"  # Optional. Name of the ConfigMap file
+                               # containing the certificate authority that
+                               # signs the certificates used by the Ops
+                               # Manager custom resource.
+
+  applicationDatabase:
+    topology: MultiCluster # if you want to deploy AppDB deployment accross multiple clusters
+    clusterSpecList:
+    # distribution of AppDB nodes across multiple Kubernetes clusters
+    - clusterName: cluster1.example.com
+      members: 4
+    - clusterName: cluster2.example.com
+      members: 3
+    - clusterName: cluster3.example.com
+      members: 2
+    version: "4.4.0-ubi8"
+    security:
+      certsSecretPrefix: <prefix> # Required. Text to prefix to the
+                                  # name of the secret that contains the Application
+                                  # Database's TLS certificate. Name the secret
+                                  # <prefix>-<metadata.name>-db-cert.
+      tls:
+        ca: "appdb-ca" # Optional. Name of the ConfigMap file
+                       # containing the certicate authority that
+                       # signs the certificates used by the
+                       # application database.