ReleaseNotes-2.7.4

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# openSUSE Build Service 2.7.4
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Updaters from OBS 2.7.0 release can just ugrade the packages
and restart all services. Updaters from former releases should
read the README.UPDATERS file.

This release fixes a few bugs and a security issue caused by to loose API
attribute permission checks.

Feature backports:
==================

* none

Changes:
========

* none

Bugfixes:
=========

* [api] Fix API permission check for creating and changing (POST) attributes
* [api] Fix API permission check for deleting (DELETE) attributes
* [webui] Invalidate cached session in LDAP mode
* [api][webui] Fail ldap authentification with empty password
* [webui] Fix repository removal when updating project meta fails with an error