Make svcutil generate public static methods instead of private

Fixes dotnet#5179

Author: 0xced

src/dotnet-svcutil/lib/src/CodeDomFixup/MethodCreationHelper.cs

@@ -25,7 +25,7 @@ public MethodCreationHelper(CodeTypeDeclaration clientType)
             this.GetEndpointAddress = new CodeMemberMethod
             {
                 Name = ConfigToCodeConstants.GetEndpointAddressMethod,
-                Attributes = MemberAttributes.Private | MemberAttributes.Static,
+                Attributes = MemberAttributes.Public | MemberAttributes.Static,
                 ReturnType = new CodeTypeReference(typeof(EndpointAddress)),
             };
 
@@ -34,7 +34,7 @@ public MethodCreationHelper(CodeTypeDeclaration clientType)
             this.GetBinding = new CodeMemberMethod
             {
                 Name = ConfigToCodeConstants.GetBindingMethod,
-                Attributes = MemberAttributes.Private | MemberAttributes.Static,
+                Attributes = MemberAttributes.Public | MemberAttributes.Static,
                 ReturnType = new CodeTypeReference(typeof(Binding)),
             };
 
@@ -412,7 +412,7 @@ private static void AddWS2007HttpBindingConfiguration(CodeStatementCollection st
                     ResultVarName,
                     new CodeObjectCreateExpression(typeof(WS2007HttpBinding))));
                 resultVar = new CodeVariableReferenceExpression(ResultVarName);
-            }            
+            }
 
             WSHttpMaxOutProperties(statements, resultVar);
 
@@ -960,7 +960,7 @@ private static void AddCustomBindingConfiguration(CodeStatementCollection statem
                     ResultVarName,
                     new CodeObjectCreateExpression(typeof(CustomBinding))));
                 resultVar = new CodeVariableReferenceExpression(ResultVarName);
-            }            
+            }
 
             foreach (BindingElement bindingElement in custom.Elements)
             {
@@ -1998,14 +1998,14 @@ private void CreateDefaultEndpointMethods(string clientTypeName, List<string> en
 
             this.GetDefaultBinding = new CodeMemberMethod
             {
-                Attributes = MemberAttributes.Static | MemberAttributes.Private,
+                Attributes = MemberAttributes.Static | MemberAttributes.Public,
                 Name = ConfigToCodeConstants.GetDefaultBindingMethod,
                 ReturnType = new CodeTypeReference(typeof(Binding)),
             };
 
             this.GetDefaultEndpointAddress = new CodeMemberMethod
             {
-                Attributes = MemberAttributes.Static | MemberAttributes.Private,
+                Attributes = MemberAttributes.Static | MemberAttributes.Public,
                 Name = ConfigToCodeConstants.GetDefaultEndpointAddressMethod,
                 ReturnType = new CodeTypeReference(typeof(EndpointAddress)),
             };