cleanup: limit ip addr flush to just 5 attempt
We sometimes see race between NM and ip addr flush in readding ipv6ll address. Limit ip addr flush to just 5 attempts and do not check it's exit code.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
We sometimes see race between NM and ip addr flush in readding ipv6ll address. Limit ip addr flush to just 5 attempts and do not check it's exit code.