Merge commit 'lamby/master' into merge

* commit 'lamby/master':
  Make import_keyring use dbconn.get_or_set_uid.
  Make import_keyring use get_or_set_keyring.
  Port database.get_or_set_keyring_id => dbconn.get_or_set_keyring
  Use gzip.open(.., 'rb') instead of gunzip and temporary filenames.

Signed-off-by: Joerg Jaspert <joerg@debian.org>