Modernize lighty-rnc postman collection

This postman collection was outdated and was missing important changes
such as "Encapsulate netconf-node state" and "Use base64 encoding for
netconf device passwords".
opendaylight/netconf@1f8be4f
opendaylight/netconf@3a7861b

Signed-off-by: tobias.pobocik <tobias.pobocik@pantheon.tech>

Author: Tobianas

lighty-applications/lighty-rnc-app-aggregator/lighty-rnc-app/Lighty-RNC.postman_collection.json

@@ -16,7 +16,7 @@
 						"header": [],
 						"body": {
 							"mode": "raw",
-							"raw": "{\n      \"netconf-topology:node\" :[ \n    \t{\n\t      \"node-id\": \"node-1\",\n\t      \"host\": \"127.0.0.1\",\n          \"port\": 17830,\n\t      \"username\": \"admin\",\n\t      \"password\": \"admin\",\n\t      \"tcp-only\": false,\n\t      \"keepalive-delay\": 0\n        }\n    ]\n  }",
+							"raw": "{\n    \"netconf-topology:node\": [\n        {\n            \"node-id\": \"node-1\",\n            \"netconf-node\": {\n                \"host\": \"127.0.0.1\",\n                \"port\": 17830,\n                \"login-password-unencrypted\": {\n                    \"username\": \"admin\",\n                    \"password\": \"admin\"\n                },\n                \"tcp-only\": false,\n                \"keepalive-delay\": 0\n            }\n        }\n    ]\n}",
 							"options": {
 								"raw": {
 									"language": "json"
@@ -107,7 +107,7 @@
 						"method": "GET",
 						"header": [],
 						"url": {
-							"raw": "http://127.0.0.1:8888/restconf/data/network-topology:network-topology/topology=topology-netconf/node=node-1/yang-ext:mount/",
+							"raw": "http://127.0.0.1:8888/restconf/data/network-topology:network-topology/topology=topology-netconf/node=node-1/yang-ext:mount",
 							"protocol": "http",
 							"host": [
 								"127",
@@ -122,8 +122,7 @@
 								"network-topology:network-topology",
 								"topology=topology-netconf",
 								"node=node-1",
-								"yang-ext:mount",
-								""
+								"yang-ext:mount"
 							]
 						}
 					},