Fix typo in mysql password param

Change-Id: I1e232d8eff3f6faedf0e505b8921425a8fffb7d5
diff --git a/metadata/service/server/single.yml b/metadata/service/server/single.yml
index b08c43d..0325c48 100644
--- a/metadata/service/server/single.yml
+++ b/metadata/service/server/single.yml
@@ -18,7 +18,7 @@
         port: 3306
         name: aodh
         user: aodh
-        password: ${_param:mysql_nova_password}
+        password: ${_param:mysql_aodh_password}
       bind:
         host: ${_param:single_address}
         port: 8042