DodoApp: Support MongoDB

Change-Id: I275f662848fb7d78b98d5e935f5ca87d73ca60ec
diff --git a/core/installer/app_test.go b/core/installer/app_test.go
index 47eb02c..a59571d 100644
--- a/core/installer/app_test.go
+++ b/core/installer/app_test.go
@@ -483,7 +483,7 @@
       name: "data"
       size: "5Gi"
     }]
-    postgresql: [{
+    mongodb: [{
       name: "db"
       size: "10Gi"
     }]