Support deferred values for requirepass

[ThiefMaster]

This requires a fairly recent stdlib (8.x), but It would be really useful if the requirepass value could be a deferred value.

I'm using this patch in my environment and it works well:

diff --git a/code/manifests/instance.pp b/code/manifests/instance.pp
index 1f97830..63b5d5f 100644
--- a/code/manifests/instance.pp
+++ b/code/manifests/instance.pp
@@ -327,7 +327,7 @@ define redis::instance (
   Boolean $repl_disable_tcp_nodelay                              = $redis::repl_disable_tcp_nodelay,
   Integer[1] $repl_ping_slave_period                             = $redis::repl_ping_slave_period,
   Integer[1] $repl_timeout                                       = $redis::repl_timeout,
-  Optional[String] $requirepass                                  = $redis::requirepass,
+  Optional[Variant[String, Deferred]] $requirepass               = $redis::requirepass,
   Boolean $save_db_to_disk                                       = $redis::save_db_to_disk,
   Hash $save_db_to_disk_interval                                 = $redis::save_db_to_disk_interval,
   String[1] $service_user                                        = $redis::service_user,
@@ -481,7 +481,7 @@ define redis::instance (
     owner   => $config_owner,
     group   => $config_group,
     mode    => $config_file_mode,
-    content => epp(
+    content => stdlib::deferrable_epp(
       $conf_template,
       {
         daemonize                     => $daemonize,

I could send a PR that also adds it in other places (I just patched this one because that's the one I'm using) but honestly I'm not an expert when it comes to Puppet modules, so it would probably not contain tests and it would require a fairly big bump of the required stdlib version.

Let me know if this is something you're interested in.

[ThiefMaster]

@bastelfreak ping :)