They were lost during migration from filesystem based constraint.

Changing field name in the form means that the field itself should also be
renamed.

For example, on Mandriva, if SECURE_TMP is enabled (in /etc/security/shell),
then TMP/TMPDIR are set to $HOME/tmp but $HOME is only accessible by the owner
and its group, but not slap user, then the extends-cache temporary directory
will not be accessible after dropping the privileges.

It will reduce execution time.

Squashed commit of the following:

commit 154041e95f9e6427c274d9c46edbba14ab66b4d6
Author: Łukasz Nowak <luke@nexedi.com>
Date:   Wed Aug 31 19:05:40 2011 +0200

    Cleanup the code (pyflaked)

commit 4cf44c7f2baf02a056d21b88a4a1a21b534aea75
Author: Łukasz Nowak <luke@nexedi.com>
Date:   Wed Aug 31 17:17:40 2011 +0200

    Cover passing SSL auth keys to buildout.

commit b8207942ba678f6dd3a34c45c56b100d94a44d87
Author: Łukasz Nowak <luke@nexedi.com>
Date:   Wed Aug 31 17:14:46 2011 +0200

    Fix typo.

commit 551a3e3c017d83ca1ba4b7a50c66d1a0b847cf8e
Author: Łukasz Nowak <luke@nexedi.com>
Date:   Wed Aug 31 17:08:39 2011 +0200

    Allow to specify and pass SSL auth key and certs.