Remove path to service binary

This commit removes the path to the service binary (which didn't
work on CentOS) and instead added a path parameter.

manifests/server.pp

@@ -48,12 +48,13 @@ class mysql::server(
   # the reason is that I need the service to be started before mods to the config
   # file which can cause a refresh
   exec{ 'mysqld-restart':
-    command => "/usr/sbin/service ${service_name} restart",
+    command     => "service ${service_name} restart",
     refreshonly => true,
+    path        => '/sbin:/usr/sbin:/usr/local/sbin:/usr/local/bin:/bin:/usr/bin:',
   }
   File{
     owner   => 'mysql',
     group   => 'mysql',
     require => Package['mysql-server'],
   }
-}
+}