Overview of changes in 3.19.90
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* Bugs fixed:
 755316 backends: Factorize common code in credential handling
 756498 kerberos: Fail early on ticket request when ticketing disabled
 760991 imap-smtp: EnsureCredentials returns TRUE even when smtp-password
        can't be found and an error is set
 761188 Use primary@REALM as the presentation identity for temporary accounts
 761510 Factorize common code in GoaBackend::build_object()

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