remove floating_ip_get_all in nova_client

We have switched to use neutron API instead, this function is no
longer needed.

Change-Id: Ia2ddc4fdab574a28c2a0f8b01cb2f4a4b8797c45

ceilometer/agent/discovery/endpoint.py

@@ -29,8 +29,7 @@ class EndpointDiscovery(plugin.DiscoveryBase):
 
     This discovery should be used when the relevant APIs are not well suited
     to dividing the pollster's work into smaller pieces than a whole service
-    at once. Example of this is the floating_ip pollster which calls
-    nova.floating_ips.list() and therefore gets all floating IPs at once.
+    at once.
     """
 
     @staticmethod

ceilometer/nova_client.py

@@ -168,8 +168,3 @@ class Client(object):
         return self.nova_client.servers.list(
             detailed=True,
             search_opts=search_opts)
-
-    @logged
-    def floating_ip_get_all(self):
-        """Returns all floating ips."""
-        return self.nova_client.floating_ips.list()