[Python] Add Flag to Allow Ignoring Operation Servers (#18981)

* [Python] Add Flag to Allow Ignoring Operation Servers

* generate samples

* add tests

samples/client/echo_api/python/openapi_client/api_client.py

@@ -228,7 +228,7 @@ class ApiClient:
             body = self.sanitize_for_serialization(body)
 
         # request url
-        if _host is None:
+        if _host is None or self.configuration.ignore_operation_servers:
             url = self.configuration.host + resource_path
         else:
             # use server/host defined in path or operation instead

samples/client/echo_api/python/openapi_client/configuration.py

@@ -33,6 +33,9 @@ class Configuration:
     """This class contains various settings of the API client.
 
     :param host: Base url.
+    :param ignore_operation_servers
+      Boolean to ignore operation servers for the API client.
+      Config will use `host` as the base url regardless of the operation servers.
     :param api_key: Dict to store API key(s).
       Each entry in the dict specifies an API key.
       The dict key is the name of the security scheme in the OAS specification.
@@ -84,6 +87,7 @@ conf = openapi_client.Configuration(
                  access_token=None,
                  server_index=None, server_variables=None,
                  server_operation_index=None, server_operation_variables=None,
+                 ignore_operation_servers=False,
                  ssl_ca_cert=None,
                  retries=None,
                  *,
@@ -102,6 +106,9 @@ conf = openapi_client.Configuration(
         self.server_operation_variables = server_operation_variables or {}
         """Default server variables
         """
+        self.ignore_operation_servers = ignore_operation_servers
+        """Ignore operation servers
+        """
         self.temp_folder_path = None
         """Temp file folder for downloading files
         """