Add #expected_upload_response_code

Author: rastating

lib/wpxf/wordpress/shell_upload.rb

@@ -55,6 +55,11 @@ def before_upload
     true
   end
 
+  # @return [Integer] the response code to expect from a successful upload operation.
+  def expected_upload_response_code
+    200
+  end
+
   # Run the module.
   # @return [Boolean] true if successful.
   def run
@@ -101,7 +106,7 @@ def upload_payload(builder)
       return false
     end
 
-    if @upload_result.code != 200
+    if @upload_result.code != expected_upload_response_code
       emit_info "Response code: #{@upload_result.code}", true
       emit_info "Response body: #{@upload_result.body}", true
       emit_error 'Failed to upload payload'