[Pkg-openldap-devel] Bug#665199: slapd: fails to install, remove, distupgrade, and install again

[Ryan Tandy]

Fixing this for upgrades from jessie to stretch requires a jessie update 
as well, to dump out the databases upon remove.

The patches I intend to submit are attached. I would appreciate it a lot 
if anyone reading this could take the time to review and try to point 
out any edge cases I missed.

The changes are intentionally minimal. Some refactoring will probably be 
in order, but that can wait for buster.

The intended paths are:

- standard upgrades from jessie to stretch should not dump/reload the 
  databases needlessly
- remove-upgrade-install from jessie to stretch with the ppolicy schema 
  installed should succeed: the config should be dumped before remove so 
  that it can be updated and reloaded in postinst
- upgrades from current jessie to stretch should still work
- if preinst fails after dumping in prerm (for example because the 
  ppolicy check decides a manual update is required), and the upgrade is 
  retried, the second prerm should dump again and the updated data 
  should be used for the upgrade
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