[Bug 1788219] [NEW] backport upstream landscape-client fixes

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[Impact]

This bug is for inclusion of a limited collection of upstream fixes affecting
some of landscape features such as

 * The dmi id for Nutanix cloud instances was added to the detection list
   for it to be properly detected as KVM.

 * Various corrections related to release-upgrades (LP: #1699179) performed
   by landscape. Those should address cases of failure to upgrade, failure
   to report upgrade success, failure to reboot after an upgrade.

 * Decoding of unicode tags when running scripts and using python3 client.
   This change is intentionally left out of trusty and xenial clients, for
   which landscape-client run on python2.7 and is different enough in
   its encoding handling. (LP: #1765518)

[Test Case]

 * Tagging a client with accented characters and running a simple
   "echo script" should be enough to validate the encoding change.

 * For the release-upgrade, one should be able to trigger one from landscape
   running on trusty or xenial. That upgrade should be reported as a success
   by landscape. A reboot command following that upgrade should also
   work, accompanied by a report of systemd errors which may have been raised
   during the action.

[Regression Potential]

 * The hypervisor change is both trivial and similar to previous
changes.

 * The tag encoding change for scripts is equally trivial for recent clients.
   It affects only code related to running shell script and, assuming bad
   system encoding, should still work the same for ASCII tags.
   However, the nature of python2.7 handling of encoding for trusty and xenial
   is different enough for this patch not to be included for them, thus
   avoiding regressions on those clients.

 * The patch which avoids apt-locks during an upgrade does have some potential
   attached. However since it's already released in bionic and cosmic,
   it's fairly well tested.

 * The upgrade success reporting patch should be safe as it's only an earlier
   import of a library which will get touched during the upgrade. Worst case
   scenario, it would only fail faster.

 * The reboot patch is not quite trivial but should be safe. It only adds an
   additional error handler in cases where shutdown command fails in order
   to try an additional method. Normal success behaviour is unchanged.

[Other Info]

 * Patches are already in the upstreams trunk.
 * Those changes have been tested by some affected users

** Affects: landscape-client (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: patch
-- 
backport upstream landscape-client fixes
https://bugs.launchpad.net/bugs/1788219
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