Only the latest version of the metrics returned while there are more than one

[candysmurf]

when run: http://localhost:8181/v1/metrics, it had the output as:

{
    "meta": {
        "code": 200,
        "message": "Metric",
        "type": "metrics_returned",
        "version": 1
    },
    "body": [{
        "last_advertised_timestamp": 1447977606,
        "namespace": "/intel/mock/*/baz",
        "version": 1
    }, {
        "last_advertised_timestamp": 1447977606,
        "namespace": "/intel/mock/*/baz",
        "version": 2
    }, {
        "last_advertised_timestamp": 1447977606,
        "namespace": "/intel/mock/bar",
        "version": 1
    }, {
        "last_advertised_timestamp": 1447977606,
        "namespace": "/intel/mock/bar",
        "version": 2
    }, {
        "last_advertised_timestamp": 1447977606,
        "namespace": "/intel/mock/foo",
        "version": 1,
        "policy": [{
            "name": "name",
            "type": "string",
            "default": "bob",
            "required": false
        }, {
            "name": "password",
            "type": "string",
            "required": true
        }]
    }, {
        "last_advertised_timestamp": 1447977606,
        "namespace": "/intel/mock/foo",
        "version": 2,
        "policy": [{
            "name": "name",
            "type": "string",
            "default": "bob",
            "required": false
        }, {
            "name": "password",
            "type": "string",
            "required": true
        }]
    }]
}

When run: http://localhost:8181/v1/metrics/intel/mock/foo, it only returned the version 2, version 1 metrics was missing in the output:

{
    "meta": {
        "code": 200,
        "message": "Metric returned",
        "type": "metric_returned",
        "version": 1
    },
    "body": {
        "Metric": {
            "last_advertised_timestamp": 1447977606,
            "namespace": "/intel/mock/foo",
            "version": 2,
            "policy": [{
                "name": "name",
                "type": "string",
                "default": "bob",
                "required": false
            }, {
                "name": "password",
                "type": "string",
                "required": true
            }]
        }
    }
}