Add router add/remove extra routes operations

Add methods to the client to call the two new member actions introduced by
new Neutron extension: extraroute-atomic.

Change-Id: Idb1fa073c2ff31f566b376cfa4f63cf27fecec86
Partial-Bug: #1826396 (rfe)
Related-Change: https://review.opendev.org/655680 (spec)

neutronclient/v2_0/client.py

@@ -934,6 +934,16 @@ class Client(ClientBase):
         return self.put((self.router_path % router) +
                         "/remove_router_interface", body=body)
 
+    def add_extra_routes_to_router(self, router, body=None):
+        """Adds extra routes to the specified router."""
+        return self.put((self.router_path % router) + "/add_extraroutes",
+                        body=body)
+
+    def remove_extra_routes_from_router(self, router, body=None):
+        """Removes extra routes from the specified router."""
+        return self.put((self.router_path % router) + "/remove_extraroutes",
+                        body=body)
+
     def add_gateway_router(self, router, body=None):
         """Adds an external network gateway to the specified router."""
         return self.put((self.router_path % router),

releasenotes/notes/extraroute-atomic-b11919d8e33b0d92.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    New client methods: ``add_extra_routes_to_router`` and
+    ``remove_extra_routes_from_router``.