qtquickcontrols2 test failures during qt5.git integration in '5.10'

There is some new test failures in qtqcuickcontrols tests, like:

• FAIL! : tst_controls::Default::TextField::test_hover(enabled) Compared values are not the same Actual (): false Expected (): true Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_textfield.qml(237)]
• FAIL! : tst_controls::Default::TextField::test_ignorePressRelease() Compared values are not the same Actual (): 0 Expected (): 1 Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_textfield.qml(385)]
• FAIL! : tst_controls::Default::AbstractButton::test_pressAndHold() 'wait for signal pressAndHold' returned FALSE. () Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_abstractbutton.qml(130)] QINFO : tst_controls::Default::AbstractButton::test_pressAndHold() [ 5.817 ] qt.qml.binding.removal unknown - Overwriting binding on TestCase_QMLTYPE_0_QML_2::qtest_temporaryObjects at file:///home/qt/work/install/qml/QtTest/TestCase.qml:619 that was initially bound at file:///home/qt/work/install/qml/QtTest/TestCase.qml:416:42
• FAIL! : tst_controls::Default::SwitchDelegate::test_mouseDrag() Compared values are not the same Actual (): 1 Expected (): 0 Loc: [/home/qt/work/qt/qtquickcontrols2/tests/auto/controls/data/tst_switchdelegate.qml(379)]
   
  Build log: https://testresults.qt.io/coin/api/results/qt/qtquickcontrols2/480bc835fc80d3029de9f308580bdcbcf572f287/LinuxUbuntu_16_04x86_64LinuxBoot2Qt_Jethroarmv7GCCqtci-linux-Ubuntu-16.04-x86_64-1-6a7b8aRelease/d0854e04ab57ffef42618f1004635ca57ea97a81/test_1504419915/testlog.txt.gz
  Details: https://testresults.qt.io/coin/integration/qt/qt5/tasks/1504418083

Tested changes (refs/builds/qtci/5.10/1504418077):
https://codereview.qt-project.org/#/q/e38a07f4e133cc5571b6649fc378301f971d3358,n,z Update submodules on '5.10' in qt5