Allow missing sysctl keys

The augeas provider prefetches them before the module has a chance to
load, so use the silent parameter instead.

manifests/node/kubelet.pp

@@ -181,6 +181,7 @@
     sysctl {
       default:
         ensure => $ensure,
+        silent => true,
         value  => '1';
 
       'net.bridge.bridge-nf-call-iptables':
@@ -193,13 +194,6 @@
 
     if $manage_kernel_modules {
       Kmod::Load['br_netfilter']
-      ~> exec { 'Wait for br_netfilter to load before kubelet sysctls':
-        command     => 'sysctl -aNr net.bridge | grep nf-call-iptables',
-        path        => $facts['path'],
-        refreshonly => true,
-        tries       => 5,
-        try_sleep   => 1,
-      }
       -> [
         Sysctl['net.bridge.bridge-nf-call-iptables'],
         Sysctl['net.bridge.bridge-nf-call-ip6tables']