ONOS-6278
=========

In topo with no discovered hosts, h1 pings h3 and ONOS discoveres both.

The following is the event trace showing the issue is resolved...

[1] host 1 added (IP address unknown)
[2] host 3 added (IP address unknown)
[3] host 3 updated (IP 10.0.0.3)
[4] host 1 updated (IP 10.0.0.1)

-----
[1]...
2017-05-04 10:45:33,879 | DEBUG | ispatch-default0 | UiWebSocket
| 158 - org.onosproject.onos-gui - 1.10.0.SNAPSHOT | TX message: 
{
    "event": "topo2UiModelEvent",
    "payload": {
        "type": "HOST_ADDED_OR_UPDATED",
        "subject": "00:00:00:00:00:01/None",
        "data": {
            "id": "00:00:00:00:00:01/None",
            "nodeType": "host",
            "layer": "def",
            "ips": [],
            "props": {}
        },
        "memo": "added"
    }
}

[2]...
2017-05-04 10:45:33,894 | DEBUG | ispatch-default0 | UiWebSocket
| 158 - org.onosproject.onos-gui - 1.10.0.SNAPSHOT | TX message: 
{
    "event": "topo2UiModelEvent",
    "payload": {
        "type": "HOST_ADDED_OR_UPDATED",
        "subject": "00:00:00:00:00:03/None",
        "data": {
            "id": "00:00:00:00:00:03/None",
            "nodeType": "host",
            "layer": "def",
            "ips": [],
            "props": {}
        },
        "memo": "added"
    }
}

[3]...
2017-05-04 10:45:38,901 | DEBUG | ispatch-default0 | UiWebSocket 
| 158 - org.onosproject.onos-gui - 1.10.0.SNAPSHOT | TX message: 
{
    "event": "topo2UiModelEvent",
    "payload": {
        "type": "HOST_ADDED_OR_UPDATED",
        "subject": "00:00:00:00:00:03/None",
        "data": {
            "id": "00:00:00:00:00:03/None",
            "nodeType": "host",
            "layer": "def",
            "ips": ["10.0.0.3"],
            "props": {}
        },
        "memo": "updated"
    }
}

[4]...
2017-05-04 10:45:38,909 | DEBUG | ispatch-default0 | UiWebSocket
| 158 - org.onosproject.onos-gui - 1.10.0.SNAPSHOT | TX message: 
{
    "event": "topo2UiModelEvent",
    "payload": {
        "type": "HOST_ADDED_OR_UPDATED",
        "subject": "00:00:00:00:00:01/None",
        "data": {
            "id": "00:00:00:00:00:01/None",
            "nodeType": "host",
            "layer": "def",
            "ips": ["10.0.0.1"],
            "props": {}
        },
        "memo": "updated"
    }
}