FakeCollectionScheduler => FakeIntervalCheck, so FakeAkonadiServer can return it
Summary:
This way AkonadiServer::instance()->intervalChecker() is never null
anymore, which simplifies some code at little bit, and will allow
testing how NotificationCollector interacts with IntervalCheck.
BTW CacheCleaner needs the if(), it's optional (null if configured away by user)
Test Plan: full "ctest"
Reviewers: dvratil
Reviewed By: dvratil
Subscribers: kde-pim
Tags: KDE PIM
Differential Revision: https://phabricator.kde.org/D20512