Improve flag setting ioctl so that bulk updates are requested only when we're going up, not when we set PROMISC or any other flag.  Fixes spontaneous CARP failovers when running tcpdump on pfsync.
Improve flag setting ioctl so that bulk updates are requested
only when we're going up, not when we set PROMISC or any other
flag.  Fixes spontaneous CARP failovers when running tcpdump
on pfsync.

ok henning, mcbride, camield

orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars,orumin/openbsd-efivars