no longer require boot_osflags being set to 'a' in the SRM for going multiuser; setting boot_osflags to 's' explicitly will get us to singleuser as usual; very old SRM versions can only set 'a' or 's', but are still fine because we ignore 'a' now and default to multiuser
no longer require boot_osflags being set to 'a' in the SRM for going multiuser; setting boot_osflags to 's' explicitly will get us to singleuser as usual; very old SRM versions can only set 'a' or 's', but are still fine because we ignore 'a' now and default to multiuser

idea and ok deraadt@, jsg@, testing by many
final ok miod@

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