Use mongodb charm in k8s installer

- Update JUJU_AGENT_VERSION to 2.8.6
- Use mongodb charm and update needed osm pod specs to point at it

Change-Id: I75734a19aaa5b3b7a8913591ee86a8e1b82b29cd
Signed-off-by: David Garcia <david.garcia@canonical.com>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/docker/osm_pods/lcm.yaml b/installers/docker/osm_pods/lcm.yaml
index 6824f63..b464861 100644
--- a/installers/docker/osm_pods/lcm.yaml
+++ b/installers/docker/osm_pods/lcm.yaml
@@ -40,13 +40,13 @@
         env:
         - name: OSMLCM_RO_HOST
           value: ro
-        - name: OSMLCM_DATABASE_HOST
-          value: mongodb-k8s
+        - name: OSMLCM_DATABASE_URI
+          value: mongodb://mongodb-k8s:27017/?replicaSet=rs0
         - name: OSMLCM_MESSAGE_HOST
           value: kafka
         envFrom:
         - secretRef:
-           name: lcm-secret
+          name: lcm-secret
         volumeMounts:
         - name: osm-packages
           mountPath: /app/storage
@@ -55,7 +55,7 @@
       volumes:
       - name: osm-packages
         hostPath:
-         path: /var/lib/osm/osm_osm_packages/_data
+          path: /var/lib/osm/osm_osm_packages/_data
       - name: prometheus-config
         hostPath:
           path: /var/lib/osm/prometheus