Update getty.debathena for logind

- Add logind support to getty.debathena (Trac: #1482)
- initialize 'sessions' in the consolekit activation so it's not
  an unbound variable in some corner cases
- Add logging so that we actuall notice when this fails in the future
- Add debugging support
Remove dconf profile; rename site snippets

- Remove the dconf user profile, another package will
  provide it.  (Due to 4ca10f2d being added after the changelog
  for 1.40 was finalized, 1.40 did not actually install these.
- Rename the site db snippets to the package name, and
  change the prefix from 00 to 10, in case we ship a base config
  later