D18758: Fix ASan error in test_cmakemanager by catching all signals before objects they are delivered to are deleted.

[Gleb Popov]

arrowd added a reviewer: KDevelop.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D18758

To: arrowd, #kdevelop
Cc: kdevelop-devel, glebaccon, antismap, iodelay, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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