print status line the same for exception/non-exception.  We now quote
message in non-exception case.

$ panxapi.py -t pa-200-ssh -Xo 'show jobs id "102"'
op: success: "Configuration committed successfully
Successfully committed last configuration"
handle ./newjob/newmsg within ./result/job/details/line of 'show jobs
xxx' response.  the response message parser makes this easy now, but
I'm still unsure if we really want to try to handle these things
because the response formats are not documented.

$ panxapi.py -t pa-200-ssh -Xjo 'show jobs id "131"'
op: success: "New content scheduled to be pushed via job 132"
{
  "response": {
    "result": {
      "job": {
        "details": {
          "line": {
            "newjob": {
              "newmsg": "New content scheduled to be pushed via job 132",
              "nextjob": "132"
            }
          }
        },
        "id": "131",
        "progress": "13:24:10",
        "result": "OK",
        "status": "FIN",
        "stoppable": false,
        "tenq": "2014/01/19 13:24:05",
        "tfin": "13:24:10",
        "type": "Install",
        "user": null,
        "warnings": null
      }
    },
    "status": "success"
  }
}