[Bug 1935972] [NEW] postinst: Rely on needrestart when present on the system

[Simon Chopin]

Public bug reported:

This patch bypasses the custom restarting logic backed into the postinst
script if the needrestart utility is present, as it allows sharing the
logic with the rest of the system.

It also changes the custom logic to compare the old package version to
the current one instead of a hard-coded value. I don't feel particularly
strongly about this, so feel free to drop it :)

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

** Patch added: "debdiff"
   https://bugs.launchpad.net/bugs/1935972/+attachment/5510736/+files/debdiff

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https://bugs.launchpad.net/bugs/1935972

Title:
  postinst: Rely on needrestart when present on the system

Status in pam package in Ubuntu:
  New

Bug description:
  This patch bypasses the custom restarting logic backed into the
  postinst script if the needrestart utility is present, as it allows
  sharing the logic with the rest of the system.

  It also changes the custom logic to compare the old package version to
  the current one instead of a hard-coded value. I don't feel
  particularly strongly about this, so feel free to drop it :)

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