[OpenNebula] tst_messagebox::sanityTest hangs on macOS 10.12

Module "qt/qtbase" (f35c713320b1e3823091667dbaa9ed69d330c5e1) Failed test(s): /Users/qt/work/qt/qtbase/tests/auto/widgets/dialogs/qmessagebox:
 agent:2017/08/03 12:13:51 build.go:391: Executing instruction 757 of 960
 agent:2017/08/03 12:13:51 build.go:278: [make check -j1] 900 1200
 /Users/qt/work/qt/qtbase/tests/auto/widgets/dialogs/qmessagebox/target_wrapper.sh  ./tst_qmessagebox -o /Users/qt/work/testresults/tests/auto/widgets/dialogs/qmessagebox111064568,xml -o -,txt
 ********* Start testing of tst_QMessageBox *********
 Config: Using QtTest library 5.10.0, Qt 5.10.0 (x86_64-little_endian-lp64 shared (dynamic) release build; by Clang 8.1.0 (clang-802.0.41) (Apple))
 PASS   : tst_QMessageBox::initTestCase()
 
 ========= Received signal, dumping stack ==============
 (lldb) process attach --pid 25762
 (lldb) bt all
 (lldb) quit
 ========= End of stack trace ==============
 QFATAL : tst_QMessageBox::sanityTest() Test function timed out
 FAIL!  : tst_QMessageBox::sanityTest() Received a fatal error.
    Loc: [Unknown file(0)]
 Totals: 1 passed, 1 failed, 0 skipped, 0 blacklisted, 302069ms
 ********* Finished testing of tst_QMessageBox *********
 make: *** [check] Abort trap: 6