:returns: Stdout, Stderr.
:rtype: tuple(str, str)
:raises RuntimeError: If bash return code is not 0.
"""
for _ in range(retries + 1):
ret_code, stdout, stderr = exec_cmd(
:returns: Stdout, Stderr.
:rtype: tuple(str, str)
:raises RuntimeError: If bash return code is not 0.
"""
for _ in range(retries + 1):
ret_code, stdout, stderr = exec_cmd(