Fixes container detector for systemd & cgroupv1 with Docker#3429

xrmx merged 4 commits intoopen-telemetry:mainopen-telemetry/opentelemetry-python-contrib:mainfrom

SeanHood:systemd-cgroupv1-detectorSeanHood/opentelemetry-python-contrib:systemd-cgroupv1-detectorCopy head branch name to clipboard