OperatingSystem: Use subprocess.Popen istead of deprecated os.popen2
OperatingSystem: Use subprocess.Popen istead of deprecated os.popen2

Update issue 1158
Status: Done

userzimmermann/robotframework-python3,Senseg/robotframework,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,Senseg/robotframework,Senseg/robotframework,userzimmermann/robotframework-python3,userzimmermann/robotframework-python3,Senseg/robotframework,Senseg/robotframework