Give `systemd-resolved` longer to initialize
Give `systemd-resolved` longer to initialize

One suspicion why a `systemd-resolved` based system fails the
sanity check is that the time allotted for that check is too short
and that a proper flush must be performed between attempts to avoid
getting hit by negative caching (yes, NXDOMAIN records are cached).

Signed-off-by: Thomas Hallgren <5f50a84c1fa3bcff146405017f36aec1a10a9e38@datawire.io>

datawire/telepresence,datawire/telepresence,datawire/telepresence