D22834: Adapt to KCalendarCore namespace change

[Volker Krause]

vkrause added reviewers: KDE PIM, dfaure.

REPOSITORY
  R170 Akonadi Calendar

REVISION DETAIL
  https://phabricator.kde.org/D22834

To: vkrause, #kde_pim, dfaure
Cc: kde-pim, dvasin, rodsevich, winterz, vkrause, mlaurent, knauss, dvratil
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