[Bug 1848399] Re: update-grub fails if zpools with unsupported feature_flags exist

[satmandu]

I have log_spacemap enabled.

zpool import -f -a -o cachefile=none -N
"This pool uses the following feature(s) not supported by this system:
	com.delphix:log_spacemap (Log metaslab changes on a single spacemap and flush them periodically.)
All unsupported features are only required for writing to the pool.
The pool can be imported using '-o readonly=on'."

Accepted for post 0.8.1:
https://github.com/zfsonlinux/zfs/pull/8442#issuecomment-511918033

(But this could happen with the import of ANY zpool from another system.
For instance from a non zfsonlinux system with different feature flags
set.)

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https://bugs.launchpad.net/bugs/1848399

Title:
  update-grub fails if zpools with unsupported feature_flags exist

Status in grub2 package in Ubuntu:
  Incomplete
Status in ubiquity package in Ubuntu:
  Invalid
Status in zsys package in Ubuntu:
  Invalid

Bug description:
  install from Oct 14 live installer failed.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: ubiquity 19.10.20
  ProcVersionSignature: Ubuntu 5.3.0-18.19-generic 5.3.1
  Uname: Linux 5.3.0-18-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu8
  Architecture: amd64
  CasperVersion: 1.425
  Date: Wed Oct 16 20:03:30 2019
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed quiet splash ---
  LiveMediaBuild: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191014)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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