Return IP type for interfaces (fixed or floating)

In nova.api.openstack.views.addresses.ViewBuilderV10, public and private IPs (floating and fixed, respectively) were returned in "public" and "private" keys, so the caller could distinguish them.

In nova.api.openstack.views.addresses.ViewBuilderV11, all IPs are mixed together, so they are indistinguishable:
          "addresses": {
                "network_0809": [
                    {
                        "addr": "10.10.0.3",
                        "version": 4
                    }
                    {
                        "addr": "A.B.C.D",
                        "version": 4
                    }
                ]
            },
Here 10.10.0.3 actually is a public IP and A.B.C.D is a private one.

An additional field "is_fixed" is added with the following patch.

--- nova/api/openstack/views/addresses.py.orig 2011-08-16 19:11:50.497003804 +0300
+++ nova/api/openstack/views/addresses.py 2011-08-16 11:37:34.779002536 +0300
@@ -76,9 +76,9 @@

     def _extract_ipv4_addresses(self, interface):
         for fixed_ip in interface['fixed_ips']:
- yield self._build_ip_entity(fixed_ip['address'], 4)
+ yield self._build_ip_entity(fixed_ip['address'], 4, 1)
             for floating_ip in fixed_ip.get('floating_ips', []):
- yield self._build_ip_entity(floating_ip['address'], 4)
+ yield self._build_ip_entity(floating_ip['address'], 4, 0)

     def _extract_ipv6_address(self, interface):
         fixed_ipv6 = interface.get('fixed_ipv6')
@@ -86,4 +86,4 @@
             return self._build_ip_entity(fixed_ipv6, 6)

     def _build_ip_entity(self, address, version, is_fixed):
- return {'addr': address, 'version': version)
+ return {'addr': address, 'version': version, "is_fixed": is_fixed}

Then output will look like:
          "addresses": {
                "network_0809": [
                    {
                        "addr": "10.10.0.3",
                        "is_fixed": 1,
                        "version": 4
                    }
                    {
                        "addr": "A.B.C.D",
                        "is_fixed": 0,
                        "version": 4
                    }
                ]
            },