Enable object replication' failure in recon

The recon for object replicator doesn't have an ability to output it's failure
such as account replicator and container replicator.

With this specification the recon for object replicator responses it's failure
to clients with the following format.

- Add replication_last, replication_stats(attempted, empty, failure, hashmatch,
  remove, rcync, start and success) in output of recon api.

curl http://endpoint:6002/recon/replication/object
{
    "replication_last": 1416334368.60865,
    "replication_stats": {
        "attempted": 13346,
        "empty": 0,
        "failure": 870,
        "hashmatch": 0,
        "remove": 0,
        "rsync", 0,
        "start": 1416354240.9761429,
        "success": 1908
    },
    "replication_time": 2316.5563162644703,
    "object_replication_last": 1416334368.60865,
    "object_replication_time": 2316.5563162644703
}

* object_replication_last and object_replication_time are remained for
  backword compatibility.

- Add replication_falilure, replication_success and replication_attempted in
  output of swift-recon.

swift-recon object -r
===============================================================================
--> Starting reconnaissance on 4 hosts
===============================================================================
[2014-11-27 16:14:09] Checking on replication
[replication_failure] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 4
[replication_success] low: 3, high: 3, avg: 3.0, total: 12, Failed: 0.0%, no_result: 0, reported: 4
[replication_time] low: 0, high: 0, avg: 0.0, total: 0, Failed: 0.0%, no_result: 0, reported: 4
[replication_attempted] low: 1, high: 1, avg: 1.0, total: 4, Failed: 0.0%, no_result: 0, reported: 4
Oldest completion was 2014-11-27 16:09:45 (4 minutes ago) by 10.124.154.35:6002.
Most recent completion was 2014-11-27 16:14:19 (-10 seconds ago) by 192.168.0.1:6002.
===============================================================================