gerrit: auto configure ssh keys

Change-Id: I9c3091e4bb998fa6c846c3c60c2801c7daa45bcf
diff --git a/core/installer/app.go b/core/installer/app.go
index 3656231..64c4078 100644
--- a/core/installer/app.go
+++ b/core/installer/app.go
@@ -285,6 +285,11 @@
 		}
 	}
 }
+
+#SSHKey: {
+	public: string
+	private: string
+}
 `
 
 type appConfig struct {