Conditionally set mysql max connections

Only install the max_connections config file for the mysql server
if we are installing the mysql server.

Change-Id: I0c9beb54d3e6982fc4c1b4de8ce1f81eb40c654d

manifests/init.pp

@@ -80,14 +80,6 @@ class nodepool (
     }
   }
 
-  file { '/etc/mysql/conf.d/max_connections.cnf':
-    ensure  => present,
-    content => "[server]\nmax_connections = 8192\n",
-    mode    => '0444',
-    owner   => 'root',
-    group   => 'root',
-  }
-
   user { 'nodepool':
     ensure     => present,
     home       => '/home/nodepool',

manifests/mysql.pp

@@ -47,4 +47,13 @@ class nodepool::mysql (
     ],
   }
 
+  file { '/etc/mysql/conf.d/max_connections.cnf':
+    ensure  => present,
+    content => "[server]\nmax_connections = 8192\n",
+    mode    => '0444',
+    owner   => 'root',
+    group   => 'root',
+    require => Class['mysql::server'],
+  }
+
 }