fix leaked handles in set_columns, complete_cmd, run_cmd_qa, det_terminal_size functions + tests #4066
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`os.popen` is used without closing the returned handle. As this function is deprecated anyway replace it by `subprocess_popen_text`.
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os.popenis used without closing the returned handle.As this function is deprecated anyway replace it by
subprocess_popen_text.Also fix some more leaked handles from opened processes and files, extracted from #3790