sentinel.pp: puppet-lint fix: only Optional params should default to undef

Author: kenyon

REFERENCE.md

@@ -1765,7 +1765,7 @@ Default value: `undef`
 
 ##### <a name="-redis--sentinel--sentinel_bind"></a>`sentinel_bind`
 
-Data type: `Variant[Undef, Stdlib::IP::Address, Array[Stdlib::IP::Address]]`
+Data type: `Optional[Variant[Undef, Stdlib::IP::Address, Array[Stdlib::IP::Address]]]`
 
 Allow optional sentinel server ip binding.  Can help overcome
 issues arising from protect-mode added Redis 3.2

manifests/sentinel.pp

@@ -183,7 +183,7 @@
   Optional[Enum['yes', 'no']] $sentinel_announce_hostnames = undef,
   Optional[Stdlib::Host] $sentinel_announce_ip = undef,
   Optional[Stdlib::Port] $sentinel_announce_port = undef,
-  Variant[Undef, Stdlib::IP::Address, Array[Stdlib::IP::Address]] $sentinel_bind = undef,
+  Optional[Variant[Undef, Stdlib::IP::Address, Array[Stdlib::IP::Address]]] $sentinel_bind = undef,
   Stdlib::Port $sentinel_port = 26379,
   Optional[Enum['yes', 'no']] $sentinel_resolve_hostnames = undef,
   Optional[Stdlib::Port::Unprivileged] $sentinel_tls_port = undef,