TT#86652 Fix utf8 fax body encoding

* decode utf8 on multipart/form-data request
	   since we encode the json for this content
	   type, and the fax body gets double encoded
	   and ends up wrong

Change-Id: I50d10879e5fe1ba99141e76d311641fcd5d568a1
(cherry picked from commit fe09f80224)
(cherry picked from commit 6a4845471e)

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

@@ -7,6 +7,7 @@ use parent qw/NGCP::Panel::Role::Entities NGCP::Panel::Role::API::Faxes/;
 
 use HTTP::Headers qw();
 use HTTP::Status qw(:constants);
+use Encode qw/decode_utf8/;
 
 use NGCP::Panel::Utils::DateTime;
 use NGCP::Panel::Utils::API::Subscribers;
@@ -119,7 +120,7 @@ sub create_item {
             subscriber => $billing_subscriber,
             destination => $form->values->{destination},
             upload => $form->values->{faxfile},
-            data => $form->values->{data},
+            data => $c->req->headers->content_type eq 'multipart/form-data' ? decode_utf8($form->values->{data}) : $form->values->{data}
         );
         $c->log->debug("faxserver output:\n");
         $c->log->debug($output);