Enable polling in file watcher#322

daniel-zullo-frequenz merged 2 commits intofrequenz-floss:v1.x.xfrequenz-floss/frequenz-channels-python:v1.x.xfrom

daniel-zullo-frequenz:fix/file-watcher-pollingdaniel-zullo-frequenz/frequenz-channels-python:fix/file-watcher-pollingCopy head branch name to clipboard