Bug Fixes

• Fix SPL build failure on PowerPC zfsonlinux/spl#516
• Fix user namespaces uid/gid mapping zfsonlinux/zfs#4177
• Fix ZPL miswrite of default POSIX ACL zfsonlinux/zfs#4520
• Linux 4.5 and 4.6 compatibility zfsonlinux/zfs#4537 zfsonlinux/zfs#4489
• Ensure /dev/disk/by-partlabel gets correctly populated zfsonlinux/zfs#4517
• Utilities now work reliably with newly created partitions zfsonlinux/zfs#3708
• Import now reliably uses device names stored in label zfsonlinux/zfs#3043
• Fix possible deadlock in zfs_secpolicy_write_perms ioctl zfsonlinux/zfs#4554
• Fix inverted logic on none elevator comparison zfsonlinux/zfs#4507
• Add 32 bit FS_IOC32_ {GET|SET}

  FLAGS compat ioctls for PPC zfsonlinux/zfs#4477