Add test for OOM killer disable
Add test for OOM killer disable

It is the best practise that only disable the OOM killer on containers where
you have also set the  `-m/--memory` option.

If the `-m/--memeory` flag is not set, this can result in the host running
out of memory and require killing the host's system processes to free memory.

Examples:

The following example limits the memory to 100M and disables the OOM
killer for this container:

    $ docker run -ti -m 100M --oom-kill-disable ubuntu:14.04 /bin/bash

The following example, illustrates a dangerous way to use the flag:

    $ docker run -ti --oom-kill-disable ubuntu:14.04 /bin/bash

The container has unlimited memory which can cause the host to run out
memory and require killing system processes to free memory.

Signed-off-by: Hu Keping <ce660952c949ad2751377b45317337be332e80ac@huawei.com>

HuKeping/docker-bench-security