Add ipc_mode for DockerOperator

[mrk-andreev]

Add ipc_mode to DockerOperator. IPC (POSIX/SysV IPC) namespace provides separation of named shared memory segments, semaphores and message queues (https://docs.docker.com/engine/reference/run/#ipc-settings---ipc).

ipc_mode (str) – Set the IPC mode for the container.
ref: https://docker-py.readthedocs.io/en/stable/containers.html

[boring-cyborg]

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[uranusjr]

If tests don’t fail (I think they would), we’ll need a new test for this.

[potiuk]

They did fail :)

[potiuk]

So need to be fixed @mrk-andreev

[mrk-andreev]

Fixed

[boring-cyborg]

Awesome work, congrats on your first merged pull request!