MT#7495 Add customerpreferences rel and fix doc.

lib/NGCP/Panel/Controller/API/Root.pm

@@ -45,6 +45,7 @@ sub GET : Allow {
     my $blacklist = {
         "DomainPreferenceDefs" => 1,
         "SubscriberPreferenceDefs" => 1,
+        "CustomerPreferenceDefs" => 1,
     };
 
     my @colls = $self->get_collections;

lib/NGCP/Panel/Role/API/Customers.pm

@@ -73,6 +73,7 @@ sub hal_from_customer {
             Data::HAL::Link->new(relation => 'profile', href => 'http://purl.org/sipwise/ngcp-api/'),
             Data::HAL::Link->new(relation => 'self', href => sprintf("%s%d", $self->dispatch_path, $customer->id)),
             Data::HAL::Link->new(relation => 'ngcp:customercontacts', href => sprintf("/api/customercontacts/%d", $customer->contact->id)),
+            Data::HAL::Link->new(relation => 'ngcp:customerpreferences', href => sprintf("/api/customerpreferences/%d", $customer->id)),
             Data::HAL::Link->new(relation => 'ngcp:billingprofiles', href => sprintf("/api/billingprofiles/%d", $billing_profile_id)),
             Data::HAL::Link->new(relation => 'ngcp:contractbalances', href => sprintf("/api/contractbalances/%d", $contract_balance->id)),
             $customer->subscriber_email_template_id ? (Data::HAL::Link->new(relation => 'ngcp:subscriberemailtemplates', href => sprintf("/api/emailtemplates/%d", $customer->subscriber_email_template_id))) : (),