VMM/serviceset: Fixed a conditional ProgrammingError.
Affects only setups with Dovecot < v1.2.beta2. Actually the SQL query in
method ServiceSet._load_by_services wasn't updated.
Removed unnecessary code, which would have also produced a
ProgrammingError, if it would have been correct.
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Upgrading vmm
=============
Upgrade instructions for different versions of vmm.
.. toctree::
:maxdepth: 1
upgrade/0.5-0.6
upgrade/0.4.x-0.5