Fix ro-k8s charm to include commonkey

Change-Id: I869b09709585c0cd1cbdd067d6837c94348872b6
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/installers/charm/ro-k8s/config.yaml b/installers/charm/ro-k8s/config.yaml
index 31eaca8..e93cc49 100755
--- a/installers/charm/ro-k8s/config.yaml
+++ b/installers/charm/ro-k8s/config.yaml
@@ -40,3 +40,7 @@
     description: Docker repository password
     type: string
     default: ""
+  database_commonkey:
+    description: Database common key
+    type: string
+    default: osm
\ No newline at end of file