Fixes bug 862658 -- ec2 metadata issue getting IPs

Was looping through a tuple of (ipv4s, ipv6s) vs just ipv4s list.. to get floating IPs.

Change-Id: Ie743012b7074ecb8b9bc6f018968e21e2f6d405d

nova/api/ec2/cloud.py

@@ -271,7 +271,8 @@ def _get_floaters_for_instance(self, context, instance, return_all=True):
         """Return all floating IPs for an instance"""
 
         ret_floaters = []
-        fixed_ips = self._get_fixed_ips_for_instance(context, instance)
+        # only loop through ipv4 addresses
+        fixed_ips = self._get_fixed_ips_for_instance(context, instance)[0]
         for ip in fixed_ips:
             floaters = self._get_floaters_for_fixed_ip(context, ip)
             # Allows a short circuit if we just need any floater.
@@ -287,6 +288,7 @@ def _get_mpi_data(self, context, project_id):
         search_opts = {'project_id': project_id}
         for instance in self.compute_api.get_all(context,
                 search_opts=search_opts):
+            # only look at ipv4 addresses
             fixed_ips = self._get_fixed_ips_for_instance(context, instance)[0]
             if fixed_ips:
                 line = '%s slots=%d' % (fixed_ips[0], instance['vcpus'])