Fix missing user credentials in vlan API

app/controllers/concerns/vlans.rb

@@ -22,6 +22,7 @@ module Vlans
     @kavlan = Grid5000::Kavlan.new
     @kavlan.tls_options = tls_options_for(:out)
     @kavlan.base_uri = api_path
+    @kavlan.user = @credentials[:cn]
   end
 
   def vlan_exist

lib/grid5000/kavlan.rb

@@ -131,7 +131,7 @@ module Grid5000
     def call_kavlan(uri, method)
       begin
         headers = { 'Accept' => Mime::Type.lookup_by_extension(:json).to_s,
-                    'X-Remote-Ident' => user }
+                    'X-Api-User-Cn' => user }
         http_request(method, uri, tls_options, 10, headers)
       rescue StandardError
         raise "Unable to contact #{uri}"
@@ -142,7 +142,7 @@ module Grid5000
       begin
         headers = { 'Accept' => Mime::Type.lookup_by_extension(:json).to_s,
                     'Content-Type' => Mime::Type.lookup_by_extension(:json).to_s,
-                    'X-Remote-Ident' => user }
+                    'X-Api-User-Cn' => user }
         http_request(method, uri, tls_options, 10, headers, data.to_json)
       rescue StandardError
         raise "Unable to contact #{uri}"