Adding manual external DB URI config

Change-Id: I24782d5b9594aebae2ec97b1196acfa2bafb6dbd
Signed-off-by: sousaedu <eduardo.sousa@canonical.com>
diff --git a/installers/charm/ro/config.yaml b/installers/charm/ro/config.yaml
index bb667d7..0d3c9a0 100644
--- a/installers/charm/ro/config.yaml
+++ b/installers/charm/ro/config.yaml
@@ -28,10 +28,28 @@
     description: Database COMMON KEY
     type: string
     default: osm
+  mongodb_uri:
+    type: string
+    description: MongoDB URI (external database)
   log_level:
     description: "Log Level"
     type: string
     default: "INFO"
+  mysql_host:
+    type: string
+    description: MySQL Host (external database)
+  mysql_port:
+    type: int
+    description: MySQL Port (external database)
+  mysql_user:
+    type: string
+    description: MySQL User (external database)
+  mysql_password:
+    type: string
+    description: MySQL Password (external database)
+  mysql_root_password:
+    type: string
+    description: MySQL Root Password (external database)
   vim_database:
     type: string
     description: "The database name."