Removed remnants of required

Author: darrelmiller

src/Microsoft.OpenApi.Readers/V3/OpenApiDocumentDeserializer.cs

@@ -42,9 +42,7 @@ public static OpenApiDocument LoadOpenApi(RootNode rootNode)
 
             var openApiNode = rootNode.GetMap();
 
-            var required = new List<string> {"info", "openapi", "paths"};
-
-            ParseMap(openApiNode, openApidoc, _openApiFixedFields, _openApiPatternFields, required);
+            ParseMap(openApiNode, openApidoc, _openApiFixedFields, _openApiPatternFields);
 
             return openApidoc;
         }

src/Microsoft.OpenApi.Readers/V3/OpenApiInfoDeserializer.cs

@@ -67,7 +67,7 @@ public static OpenApiInfo LoadInfo(ParseNode node)
             var info = new OpenApiInfo();
             var required = new List<string> {"title", "version"};
 
-            ParseMap(mapNode, info, InfoFixedFields, InfoPatternFields, required);
+            ParseMap(mapNode, info, InfoFixedFields, InfoPatternFields);
 
             return info;
         }

src/Microsoft.OpenApi.Readers/V3/OpenApiParameterDeserializer.cs

@@ -117,7 +117,7 @@ public static OpenApiParameter LoadParameter(ParseNode node)
             var parameter = new OpenApiParameter();
             var required = new List<string> {"name", "in"};
 
-            ParseMap(mapNode, parameter, _parameterFixedFields, _parameterPatternFields, required);
+            ParseMap(mapNode, parameter, _parameterFixedFields, _parameterPatternFields);
 
             return parameter;
         }

src/Microsoft.OpenApi.Readers/V3/OpenApiResponseDeserializer.cs

@@ -60,7 +60,7 @@ public static OpenApiResponse LoadResponse(ParseNode node)
 
             var requiredFields = new List<string> {"description"};
             var response = new OpenApiResponse();
-            ParseMap(mapNode, response, _responseFixedFields, _responsePatternFields, requiredFields);
+            ParseMap(mapNode, response, _responseFixedFields, _responsePatternFields);
 
             return response;
         }

src/Microsoft.OpenApi.Readers/V3/OpenApiV3Deserializer.cs

@@ -19,8 +19,7 @@ private static void ParseMap<T>(
             MapNode mapNode,
             T domainObject,
             FixedFieldMap<T> fixedFieldMap,
-            PatternFieldMap<T> patternFieldMap,
-            List<string> requiredFields = null)
+            PatternFieldMap<T> patternFieldMap)
         {
             if (mapNode == null)
             {
@@ -30,7 +29,6 @@ private static void ParseMap<T>(
             foreach (var propertyNode in mapNode)
             {
                 propertyNode.ParseField(domainObject, fixedFieldMap, patternFieldMap);
-                requiredFields?.Remove(propertyNode.Name);
             }
 
         }