Pin version of charmed MongoDB to use channel latest/stable

Change-Id: I5ac276ff9984252951e57e7e0fd67f4ed7e8e58b
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/installers/full_install_osm.sh b/installers/full_install_osm.sh
index 8c651e2..4a4287a 100755
--- a/installers/full_install_osm.sh
+++ b/installers/full_install_osm.sh
@@ -507,7 +507,7 @@
 function deploy_charmed_services() {
     [ -z "${DEBUG_INSTALL}" ] || DEBUG beginning of function
     juju add-model $OSM_STACK_NAME $OSM_VCA_K8S_CLOUDNAME
-    juju deploy ch:mongodb-k8s -m $OSM_STACK_NAME
+    juju deploy ch:mongodb-k8s -m $OSM_STACK_NAME --channel latest/stable
     [ -z "${DEBUG_INSTALL}" ] || DEBUG end of function
 }