Merge topic 'tests-no-c++98'

61bea8f3c8 Tests: Remove incidental use of C++98 compiler modes
02ec5c4ad2 Tests: Add missing include in sleep sources

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Reviewed-by: Raul Tambre <raul@tambre.ee>
Merge-request: !7206