MODULES-10763 Do not report apt-get update as a change

manifests/update.pp

@@ -56,13 +56,25 @@
   } else {
     $_refresh = true
   }
+  $apt_update_successful = @("ASH"/$)
+    try=1
+    while [ $try -le ${apt::_update['tries']} ]; do
+      timeout ${apt::_update['timeout']} ${apt::provider} update && exit 0
+      [ \$try -eq 1 ] && exit \$?
+      sleep 1
+      try=$(( try + 1 ))
+    done
+    - ASH
   exec { 'apt_update':
-    command     => "${apt::provider} update",
+    command     => "echo ${apt::provider} update FAILED",
     loglevel    => $apt::_update['loglevel'],
     logoutput   => 'on_failure',
+    path        => '/bin:/usr/bin',
+    provider    => shell,
     refreshonly => $_refresh,
+    returns     => [-1], # This ensures a run-time failure.
     timeout     => $apt::_update['timeout'],
     tries       => $apt::_update['tries'],
-    try_sleep   => 1,
+    unless      => $apt_update_successful,
   }
 }