 Allow opening the db on chattr +i
 Allow opening the db on chattr +i

This is done by ignoring EPERM on open() just like we ignore EROFS.

Signed-off-by: Laurent Bercot <3aa9adbbb49a4d5ab9c798d5e366f54570870800@appnovation.com>

skarnet/s6-rc,skarnet/s6-rc