Move to using ssh_authorized_key type

There is a builtin type for adding authorized_keys. We started
using it for the restricted access for the puppet triggering key,
and it seems to make sense to be consistent across the board.

Change-Id: I76ffb0136c58c05fa7c8abb793cb8e3b03cb5f6c

manifests/virtual/localuser.pp

@@ -36,13 +36,11 @@ define user::virtual::localuser(
     require => User[$title],
   }
 
-  file { "${title}_keys":
+  ssh_authorized_key { "${title}_keys":
     ensure  => present,
-    content => $sshkeys,
-    group   => $title,
-    mode    => '0400',
-    name    => "${home}/.ssh/authorized_keys",
-    owner   => $title,
+    key     => $sshkeys,
+    user    => $title,
+    type    => 'ssh-rsa',
     require => File["${title}_sshdir"],
   }
 }