[Development] Merge, Integration and etc status report - 2018.12.03

[Liang Qi]

Issues

* qtbase dev is locked, see https://lists.qt-project.org/pipermail/development/2018-December/034413.html

Integrations

* qt5 5.9/5.11/5.12 integrations are healthy, 5.11.3 and 5.12.0 will be out soon
* qt5 dev integrations: qtbase didn't update for more than 1 month(see https://codereview.qt-project.org/#/c/243935/ ), last qt5 dev submodule update without qtbase happened in Dec. 1, https://codereview.qt-project.org/#/c/162742/
	* https://bugreports.qt.io/browse/QTBUG-72113 qtwebengine: tests/auto/quick/dialogs/tst_dialogs failed on RHEL 7.4

--Liang