In some cases kolabd fails to cleanly update IMAP mailbox after LDAP changes. That is usual when result_attribute value is in upper case. Mailbox modification seems to follow slightly different code path, by shortcutting to IMAP pykolab function...
..."has_folder()" instead of going via "user_mailbox_exists()", which has a code to downcase mailbox name.
Do not shortcut to "has_folder()" function, use "user_mailbox_exists()" to downcase mailbox name before checking if it exists.
Test Plan: none
Reviewers: vanmeeuwen, machniak
Reviewed By: machniak
Subscribers: adomaitis, petersen, machniak, vanmeeuwen
Differential Revision: https://git.kolab.org/D571