platform: use also statvfs() to check for udevd

Check whether or not there is a running udevd by using statvfs() on "/sys" and use access() as a fallback. This is in line with what is done by systemd [1] and helps in case NM is not really running in a container but has been confined by a MAC so it does not have full access to sysfs (access() returns EACCES). This fixes


Edited by Alfonso Sanchez-Beato

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