Installer: deallocate ports upon app uninstall

Change-Id: I19298537fed02de03a9e74fa351cf23f733de699
diff --git a/core/installer/schema.go b/core/installer/schema.go
index 8ddf73f..943ef8a 100644
--- a/core/installer/schema.go
+++ b/core/installer/schema.go
@@ -61,6 +61,7 @@
 	domain: string
 	allocatePortAddr: string
 	reservePortAddr: string
+	deallocatePortAddr: string
 }
 
 value: { %s }