Comment 9 for bug 1645515

Ubuntu server jenkins now runs integration tests with for xenial-proposed.
It's latest run at [1] passed and ran the tests listed below that verify
this bug if fixed.

  bug 1645515 tests/vmtests/test_iscsi.py
  bug 1665701 tests/vmtests/test_nvme.py tests/vmtests/test_basic.py

I've attached 2 files to bug 1665701 for posterity
  curtin-vmtest-proposed-x-22-archive.zip [2]
  curtin-vmtest-proposed-x-22-console.log [3]
artifacts of curtin vmtest-proposed-x build 22

You can verify that the installation of curtin used the version shown by:
$ grep -r "Installation started" archive/ | head -n 1
archive/output/ZestyTestNetworkIPV6Vlan/logs/install-serial.log:[ 9.954624] cloud-init[1518]: curtin: Installation started. (0.1.0~bzr470-0ubuntu1~16.04.1)

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[1] https://jenkins.ubuntu.com/server/view/Curtin/job/curtin-vmtest-proposed-x/22/
[2] https://bugs.launchpad.net/ubuntu/+source/btrfs-progs/+bug/1665701/+attachment/4834791/+files/curtin-vmtest-proposed-x-22-archive.zip
[3] https://bugs.launchpad.net/ubuntu/+source/btrfs-progs/+bug/1665701/+attachment/4834792/+files/curtin-vmtest-proposed-x-22-console.log