nbi k8s manifest: updated OSMNBI_DATABASE_HOST env var

Change-Id: I8126ae05dae62aad64f9352bf7ab411556b6fea7
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

installers/docker/osm_pods/nbi.yaml

@@ -56,7 +56,7 @@ spec:
           protocol: TCP
         env:
          - name: OSMNBI_DATABASE_HOST
-           value: mongo
+           value: mongodb-k8s
          - name:  OSMNBI_MESSAGE_HOST
            value: kafka
         envFrom: