Deployment of Tendermint + BigchainDB cluster

- Update existing docker-containers to support tendermint integration, nginx,
  mongodb, bigchaindb
- Add tendermint configuration files for statefulset, pvc, pv and service.
- Update some READMEs.

k8s/nginx-https/nginx-https-dep.yaml

@@ -75,6 +75,21 @@ spec:
             configMapKeyRef:
               name: vars
               key: bigchaindb-ws-port
+        - name: TM_PUB_KEY_ACCESS_PORT
+          valueFrom:
+            configMapKeyRef:
+              name: tendermint-config
+              key: tm-pub-key-access
+        - name: TM_BACKEND_HOST
+          valueFrom:
+            configMapKeyRef:
+              name: tendermint-config
+              key: ngx-tendermint-instance-name
+        - name: TM_P2P_PORT
+          valueFrom:
+            configMapKeyRef:
+              name: tendermint-config
+              key: tm-p2p-port
         ports:
         # return a pretty error message on port 80, since we are expecting
         # HTTPS traffic.
@@ -87,6 +102,12 @@ spec:
         - containerPort: "<cluster-health-check-port from ConfigMap>"
           protocol: TCP
           name: ngx-port
+        - containerPort: "<tm-pub-key-access from ConfigMap>"
+          protocol: TCP
+          name: tm-pub-key
+        - containerPort: "<tm-p2p-port from ConfigMap>"
+          protocol: TCP
+          name: tm-p2p-port
         livenessProbe:
           httpGet:
             path: /health