Added stream support to Container.exec_run().

[MattBelle]

Added support for streaming output in Container.exec_run(). Streaming functionality should support demuxed output if specified. Return format should match docker's python library.

[inknos]

I would say that once the comments are addressed we are good to merge. The PR is in a very nice shape now 😃

[inknos]

@MattBelle any update on the open conversations? :)

[inknos]

thank you @MattBelle

/lgtm /approve

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: inknos, MattBelle

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