K8s manifest files updated to use docker tag 7 instead of latest

Change-Id: I5cbec8d6c4aed6612121391254f9f7e4d8fa0e6c
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/docker/osm_pods/ro.yaml b/installers/docker/osm_pods/ro.yaml
index d63ed58..f98f69b 100644
--- a/installers/docker/osm_pods/ro.yaml
+++ b/installers/docker/osm_pods/ro.yaml
@@ -50,7 +50,7 @@
         command: ["sh", "-c", "until nc -zvw1 mysql 3306; do  sleep 3 ; done; exit 0"]
       containers:
       - name: ro
-        image: opensourcemano/ro:latest
+        image: opensourcemano/ro:7
         ports:
         - containerPort: 9090
           protocol: TCP