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Executes supplied utility with supplied parameters
:param util_path: string with path to callable utility
:param params: utility parameters
:param stderr: trigger to return stderr or not
:return: Cortege (ret_code, cagefsctl_stdout) if stderr is False
Cortege (ret_code, cagefsctl_stdout, cagefsctl_stderr) otherwise
T)stdoutstderrtextN)appendextend
subprocessPopenPIPE communicate
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