Add support to floating ip port forwarding

To extend Horizon to allow users to create
port forwarding rules for their floating ips,
we need to extend this client to allow it,
as Horizon uses this client.

This patch is the one of a series of patches
to implement floating ip port forwarding with
port ranges.

The specification is defined in:
https://github.com/openstack/neutron-specs/blob/master/specs/wallaby/port-forwarding-port-ranges.rst

Implements: blueprint floatingips-portforwarding-ranges
Related-Bug: #1885921
Change-Id: I3f616dba5e2ebe301cf6ce4bed8c2e6e4da2da9b

neutronclient/v2_0/client.py

@@ -515,6 +515,8 @@ class Client(ClientBase):
     router_path = "/routers/%s"
     floatingips_path = "/floatingips"
     floatingip_path = "/floatingips/%s"
+    port_forwardings_path = "/floatingips/%s/port_forwardings"
+    port_forwarding_path = "/floatingips/%s/port_forwardings/%s"
     security_groups_path = "/security-groups"
     security_group_path = "/security-groups/%s"
     security_group_rules_path = "/security-group-rules"
@@ -1019,6 +1021,32 @@ class Client(ClientBase):
         """Deletes the specified floatingip."""
         return self.delete(self.floatingip_path % (floatingip))
 
+    def show_port_forwarding(self, floatingip, portforwarding):
+        """Fetches information of a certain portforwarding"""
+        return self.get(self.port_forwarding_path % (floatingip,
+                                                     portforwarding))
+
+    def list_port_forwardings(self, floatingip, retrieve_all=True, **_params):
+        """Fetches a list of all portforwardings for a floatingip."""
+        return self.list('port_forwardings',
+                         self.port_forwardings_path % floatingip, retrieve_all,
+                         **_params)
+
+    def create_port_forwarding(self, floatingip, body=None):
+        """Creates a new portforwarding."""
+        return self.post(self.port_forwardings_path % floatingip, body=body)
+
+    def delete_port_forwarding(self, floatingip, portforwarding):
+        """Deletes the specified portforwarding."""
+        return self.delete(self.port_forwarding_path % (floatingip,
+                                                        portforwarding))
+
+    def update_port_forwarding(self, floatingip, portforwarding, body=None):
+        """Updates a portforwarding."""
+        return self.put(self.port_forwarding_path % (floatingip,
+                                                     portforwarding),
+                        body=body)
+
     def create_security_group(self, body=None):
         """Creates a new security group."""
         return self.post(self.security_groups_path, body=body)

releasenotes/notes/add-support-to-floating-ip-port-forwardings-9dc838a5c5727eb7.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Add support to floating ip port forwarding.