Add process dump functionality for WCOW/LCOW

[dcantah]

This commit adds support for generating process dumps for hypervisor isolated containers. This includes
a new annotation to specify where process dumps should get placed on creation, which is global
to all containers.

This was verified the following way through crictl:

Linux Pod spec
--------------
{
    "metadata": {
        "name": "sandbox-coredump",
        "namespace": "default",
        "attempt": 1
    },
    "annotations": {
        "io.microsoft.container.processdumplocation": "/coredumps/core.%s.%e.%P.%t" 
    }
}

Linux container spec 
-----------------
{
        "metadata": {
                "name": "coredump-test"
        },
        "image": {
                "image": "docker.io/library/ubuntu:latest"
        },
        "command": [
                "sh",
                "-c",
                "while true; do echo 'Hello, World!'; sleep 1; done"
        ],
        "mounts": [
                {
                        "container_path": "/coredumps",
                        "host_path": "sandbox:///core"
                },
                {
                         "container_path": "/host",
                         "host_path": "C:\\users\\dcanter\\desktop\\coredump"
                }
        ],
        "annotations": {
                "io.microsoft.lcow.rlimitcore": "18446744073709551615;18446744073709551615"
        },
        "linux": {}
}

Get a shell into the container and then grab the current pid (echo $$) and do a kill -6 <pid>. Re-exec in and there should be a file in /coredumps named something like "core.6.sh.176.1626339581". Then cp the file to /host and try out gdb on the file through wsl. gdb -c /mnt/c/Users/dcanter/desktop/coredump/core.6.sh.176.1626339581

Below is the Windows configs for this as well:

Windows Pod Spec:
--------------
{
    "metadata": {
        "name": "sandbox-wcow",
        "namespace": "default",
        "attempt": 1
    },
    "annotations": {
        "io.microsoft.container.processdumplocation": "C:\\crashdump"
    }
}

Windows container spec 
-----------------
{
        "metadata": {
                "name": "wcow-test"
        },
        "image": {
                "image": "cplatpublic.azurecr.io/crashdump:latest"
        },
        "command": [
                "C:\\app\\crashtest.exe",
                "so"
        ],
        "mounts": [{
                "container_path": "C:\\crashdump",
                "host_path": "C:\\users\\dcanter\\desktop\\coredump"
        }]
}

Afterwards there should a dmp at whatever the specified directory was. The container image is a slightly modified version of https://github.com/spreadex/win-docker-crash-dump. As we're setting wersvc to auto-start Stackoverflow exceptions work as well.

Signed-off-by: Daniel Canter [email protected]

[anmaxvl]

lgtm

[dcantah]

@katiewasnothere Responded to feedback, ptal when you get another chance!

[dcantah]

@katiewasnothere Ping

[katiewasnothere]

Once the windows sandbox mount PR is merged, we should add a test for it here and then I think we're good to merge.

[dcantah]

@katiewasnothere Checking in shortly now that the sandbox pr is in and a new test