Update locales test for Debian 9

Author: Helen Campbell

spec/acceptance/locales_spec.rb

@@ -63,7 +63,7 @@ class { 'mysql::server::backup':
     let(:pp) do
       <<-MANIFEST
       mysql::db { 'mydb':
-        user     => 'thisisalongusernametestfortodayandtomorrowandthenextday',
+        user     => 'thisisalongusernametestfortodayandtomorrowandthenextdayandthedayafteeeeeeerrrrrrrrrrrrrrr',
         password => 'mypass',
         host     => 'localhost',
         grant    => ['SELECT', 'UPDATE'],