Remove redundant Optional data types

When a parameter has a default, there is no way to set it back to undef.
That means the Optional part is redundant and the data type can be
simplified.

Author: ekohl

manifests/init.pp

@@ -376,12 +376,12 @@
   Optional[String] $dhcp_peer_address = undef,
   Enum['standalone', 'primary', 'secondary'] $dhcp_node_type = 'standalone',
   Optional[String] $dhcp_failover_address = $foreman_proxy::params::dhcp_failover_address,
-  Optional[Stdlib::Port] $dhcp_failover_port = 519,
-  Optional[Integer[0]] $dhcp_max_response_delay = 30,
-  Optional[Integer[0]] $dhcp_max_unacked_updates = 10,
-  Optional[Integer[0]] $dhcp_mclt = 300,
-  Optional[Integer[0, 255]] $dhcp_load_split = 255,
-  Optional[Integer[0]] $dhcp_load_balance = 3,
+  Stdlib::Port $dhcp_failover_port = 519,
+  Integer[0] $dhcp_max_response_delay = 30,
+  Integer[0] $dhcp_max_unacked_updates = 10,
+  Integer[0] $dhcp_mclt = 300,
+  Integer[0, 255] $dhcp_load_split = 255,
+  Integer[0] $dhcp_load_balance = 3,
   Boolean $dhcp_manage_acls = $foreman_proxy::params::dhcp_manage_acls,
   Boolean $dns = false,
   Foreman_proxy::ListenOn $dns_listen_on = 'https',