Uniqueness checks for floating ip addresses.

Fixes bug 1003392.

Change-Id: I3f4554659c68476539c82d359cc080b34088b3ae

bin/nova-manage

@@ -431,11 +431,17 @@ class FloatingIpCommands(object):
             pool = FLAGS.default_floating_pool
         if not interface:
             interface = FLAGS.public_interface
-        for address in self.address_to_hosts(ip_range):
-            db.floating_ip_create(admin_context,
-                                  {'address': str(address),
-                                   'pool': pool,
-                                   'interface': interface})
+
+        ips = ({'address': str(address), 'pool': pool, 'interface': interface}
+               for address in self.address_to_hosts(ip_range))
+        try:
+            db.floating_ip_bulk_create(admin_context, ips)
+        except exception.FloatingIpExists as exc:
+            # NOTE(simplylizz): Maybe logging would be better here
+            # instead of printing, but logging isn't used here and I
+            # don't know why.
+            print('error: %s' % exc)
+            sys.exit(1)
 
     @args('--ip_range', dest="ip_range", metavar='<range>', help='IP range')
     def delete(self, ip_range):