[Bug 1843007] [NEW] namespace: make MountFlags=shared work again

[Harri-afaics]

Public bug reported:

Systemd in Bionic fails to handle MountFlags correctly. Would you mind
to include
https://github.com/systemd/systemd/commit/37ed15d7edaf59a1fc7c9e3552cd93a83f3814ef
into Bionic? This bug seriously affects Docker > 18.6, see the Docker
release notes for 18.09.1 (https://docs.docker.com/engine/release-
notes/#18091).

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


** Tags: bionic docker systemd

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https://bugs.launchpad.net/bugs/1843007

Title:
  namespace: make MountFlags=shared work again

Status in systemd package in Ubuntu:
  New

Bug description:
  Systemd in Bionic fails to handle MountFlags correctly. Would you mind
  to include
  https://github.com/systemd/systemd/commit/37ed15d7edaf59a1fc7c9e3552cd93a83f3814ef
  into Bionic? This bug seriously affects Docker > 18.6, see the Docker
  release notes for 18.09.1 (https://docs.docker.com/engine/release-
  notes/#18091).

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