[Bug 1608927] Re: fix postinst in s390-tools in xenial

[Dimitri John Ledkov]

Upgrading 8 -> 8.4 removes the stray directory. Reinstalling 8.4 shows
the warning. (Original bug is reproduced)

Upgrading 8.4 -> 8.5 is without warnings, reinstalling 8.5 shows no
warnings. (Confirms that 8.5 fixes this bug)

Upgrading s390-tools 1.34.0-0ubuntu8 -> 1.34.0-0ubuntu8.5 removes the stray /3770 dir.
Reinstalling 1.34.0-0ubuntu8.5 does not have any warnings. (Confirming that cleanup of stray /3770 directory since 16.04.0 has not regressed, aka 8.1 test-case)


** Tags removed: verification-needed verification-needed-xenial
** Tags added: verification-done verification-done-xenial

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https://bugs.launchpad.net/bugs/1608927

Title:
  fix postinst in s390-tools in xenial

Status in s390-tools package in Ubuntu:
  Invalid
Status in s390-tools source package in Xenial:
  Fix Committed

Bug description:
  
  [Impact] 

   * On each upgrade there is an attempt to remove bogus directory which
  has been gone since 1.34.0-0ubuntu8.1, thus the guard to remove the
  directory should use the correct version number for xenial, i.e.
  1.34.0-0ubuntu8.1 not 1.34.0-0ubuntu10.

   * as per infinity, the version check is wrong firing on every
  upgrade.

  [Test Case]

   * install s390-tools from updates
   * upgrade to this new version from proposed
   * during this upgrade one should not see error message from rmdir

  Setting up s390-tools (1.34.0-0ubuntu8.5) ...
  rmdir: failed to remove '/3770': No such file or directory

  [Regression Potential]

   * This is a fixup of a typo in version check, it is a cosmetic change
  to make sure pointless warnings are not shown. There is little harm in
  trying to remove the bogus/gone directory. And even less harm in
  stopping to try to remove it going further.

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