Add metadata summary per FM-1523

Author: Lauren Rother

metadata.json

@@ -2,7 +2,7 @@
   "name": "puppetlabs-mysql",
   "version": "3.0.0",
   "author": "Puppet Labs",
-  "summary": "Mysql module",
+  "summary": "Installs, configures, and manages the MySQL service.",
   "license": "Apache 2.0",
   "source": "git://github.com/puppetlabs/puppetlabs-mysql.git",
   "project_page": "http://github.com/puppetlabs/puppetlabs-mysql",