[Bug 1833079] [NEW] backport librbd librados py3 string encoding fixes

[Edward Hope-Morley]

Public bug reported:

These fixes relate to issues we have found in Openstack [1][2] when
running under Python 3. They are fixed upstream by commit [3] which is
available in nautilus and beyond so we would like to backport to mimic
and luminous.

[1] https://bugs.launchpad.net/nova/+bug/1816468
[2] https://bugs.launchpad.net/glance-store/+bug/1816721
[3] https://github.com/ceph/ceph/commit/c36d0f1a7de4668eb81075e4a94846cf81fc30cd

** Affects: cloud-archive
     Importance: Undecided
         Status: New

** Affects: cloud-archive/rocky
     Importance: Undecided
         Status: New

** Affects: cloud-archive/stein
     Importance: Undecided
         Status: New

** Affects: cloud-archive/train
     Importance: Undecided
         Status: New

** Affects: ceph (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: ceph (Ubuntu Cosmic)
     Importance: Undecided
         Status: New

** Affects: ceph (Ubuntu Disco)
     Importance: Undecided
         Status: New

** Affects: ceph (Ubuntu Eoan)
     Importance: Undecided
         Status: New

** Also affects: cloud-archive
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/rocky
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/stein
   Importance: Undecided
       Status: New

** Also affects: cloud-archive/train
   Importance: Undecided
       Status: New

** Also affects: ceph (Ubuntu Eoan)
   Importance: Undecided
       Status: New

** Also affects: ceph (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: ceph (Ubuntu Disco)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1833079

Title:
  backport librbd librados py3 string encoding fixes

Status in Ubuntu Cloud Archive:
  New
Status in Ubuntu Cloud Archive rocky series:
  New
Status in Ubuntu Cloud Archive stein series:
  New
Status in Ubuntu Cloud Archive train series:
  New
Status in ceph package in Ubuntu:
  New
Status in ceph source package in Cosmic:
  New
Status in ceph source package in Disco:
  New
Status in ceph source package in Eoan:
  New

Bug description:
  These fixes relate to issues we have found in Openstack [1][2] when
  running under Python 3. They are fixed upstream by commit [3] which is
  available in nautilus and beyond so we would like to backport to mimic
  and luminous.

  [1] https://bugs.launchpad.net/nova/+bug/1816468
  [2] https://bugs.launchpad.net/glance-store/+bug/1816721
  [3] https://github.com/ceph/ceph/commit/c36d0f1a7de4668eb81075e4a94846cf81fc30cd

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