(IAC-746) - Set mysql package name for Ubuntu 20.04

Author: David Swan

manifests/params.pp

@@ -255,6 +255,7 @@
         'trusty'           => 'ruby-mysql',
         'xenial'           => 'ruby-mysql',
         'bionic'           => 'ruby-mysql2',
+        'focal'           => 'ruby-mysql2',
         default            => 'libmysql-ruby',
       }
     }