Bump puppetlabs-apt to 2.1.0

This is needed for the puppet-grafana module, so we need to do it here
since all dependencies come from system-config.

Change-Id: Ic3000ea2aa70d5f1dff548dbe381b159255bef45
Depends-On: Iaee167602523bc497515a31fdbea74728e94c55d
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

manifests/init.pp

@@ -76,11 +76,13 @@ class puppet (
     }
 
     apt::source { 'puppetlabs':
-      location   => 'http://apt.puppetlabs.com',
-      repos      => 'main',
-      key        => '4BD6EC30',
-      key_server => 'pgp.mit.edu',
-      release    => $puppet_release,
+      location => 'http://apt.puppetlabs.com',
+      repos    => 'main',
+      key      => {
+        'id'     => '4BD6EC30',
+        'server' => 'pgp.mit.edu',
+      },
+      release  => $puppet_release,
     }
 
     file { '/etc/apt/apt.conf.d/80retry':