Stub-implement floating-ip functions on FlatManager

This was messing up horizon in a way that would probably be difficult to fix.
It also is probably a bit tricky to implement floating ips properly for
FlatManager at this stage of the release cycle.  Stub them out for now,
to keep horizon happy.

Bug #954580
Bug #937227

Change-Id: Icb8d689860b893ebeeee02e248e836c52830b2de

nova/network/manager.py

@@ -1635,6 +1635,35 @@ def _teardown_network_on_host(self, context, network):
         """Tear down network on this host."""
         pass
 
+    # NOTE(justinsb): The floating ip functions are stub-implemented.
+    # We were throwing an exception, but this was messing up horizon.
+    # Timing makes it difficult to implement floating ips here, in Essex.
+
+    @wrap_check_policy
+    def get_floating_ip(self, context, id):
+        """Returns a floating IP as a dict"""
+        return None
+
+    @wrap_check_policy
+    def get_floating_pools(self, context):
+        """Returns list of floating pools"""
+        return {}
+
+    @wrap_check_policy
+    def get_floating_ip_by_address(self, context, address):
+        """Returns a floating IP as a dict"""
+        return None
+
+    @wrap_check_policy
+    def get_floating_ips_by_project(self, context):
+        """Returns the floating IPs allocated to a project"""
+        return []
+
+    @wrap_check_policy
+    def get_floating_ips_by_fixed_address(self, context, fixed_address):
+        """Returns the floating IPs associated with a fixed_address"""
+        return []
+
 
 class FlatDHCPManager(RPCAllocateFixedIP, FloatingIP, NetworkManager):
     """Flat networking with dhcp.