wkdev-enter: Show container log, while waiting for initialization #57
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Show an excerpt from the container log after waiting for N seconds to try to enter the container.
This helps the user to indicate progress, when entering a freshly created container for the first time (when wkdev-init is running for the first time). At the same time, no output is shown upon successive wkdev-enter commands, since the container is already initialized, and entering it is fast by definition.