add host parameter back to mysql configuration - fixes accidental regression...

add host parameter back to mysql configuration - fixes accidental regression in commit 3f4368d2

lib/configuration.js

@@ -91,6 +91,7 @@ var conf = module.exports = convict({
       format: 'string?',
       env: 'MYSQL_PASSWORD'
     },
+    host: 'string?',
     create_schema: 'boolean = true',
     may_write: 'boolean = true',
     name: {