Add metricbeat with JMX support to Vamp Docker packages

[olafmol]

So we can monitor and debug Vamp performance.

elastic/beats#3570

[iamtew]

The Jolokia/JMX module in metricbeat requires us to add the Jolokia REST API to Vamp, which we don't want to do.

Better approach would be to query the Vamp API and collect the JVM metrics and ship them to ES somehow, either through our own metricbeat module, or we make our own beat for this purpose.

The info we want is available in through the API:

$ curl -sSL http://127.0.0.1:8080/api/v1/info?on=jvm | python -m json.tool
{
    "jvm": {
        "memory": {
            "heap": {
                "committed": 364380160,
                "init": 130023424,
                "max": 1834483712,
                "used": 208457208
            },
            "non_heap": {
                "committed": 127221760,
                "init": 2555904,
                "max": -1,
                "used": 120121640
            }
        },
        "operating_system": {
            "architecture": "amd64",
            "available_processors": 4.0,
            "name": "Linux",
            "system_load_average": 1.142578125,
            "version": "4.9.9-100.fc24.x86_64"
        },
        "runtime": {
            "process": "17@99b4c4556d8d",
            "start_time": 1487760772070,
            "up_time": 711171,
            "virtual_machine_name": "OpenJDK 64-Bit Server VM",
            "virtual_machine_vendor": "Oracle Corporation",
            "virtual_machine_version": "25.121-b13"
        },
        "threads": {
            "count": 28,
            "daemon_count": 7,
            "peak_count": 28,
            "total_started_count": 29
        }
    },
    "message": "Hi, I'm Vamp! How are you?",
    "running_since": "2017-02-22T10:52:55.296Z",
    "uuid": "04c7c310-ddec-4839-9131-d08f9a1182d1",
    "version": "0.9.3-29-g3210e71"
}