Merge changes from origin/7.1

Merge changes from origin/7.1

7112abe Preventing premature start of drag due to Chrome move event #13381
7e7b623 reduce frequency of session locking and StreamingProgressEvents (#13155)
7cab7fd Improve error message when reusing UI instance (#13457)
3e53fa6 Fixed "EEE" in DateField's date pattern (#13443)
1881ea8 Fix for width issue of TabSheet (#12805)
396820e Test for streaming reconnect issue (#13435)
2f93186 Eliminate .v-caption memory leak (#13346)
0c7cbc7 Fixes a memory leak on IE8 in LayoutManagerIE8 (#12688)
5441ef0 Merged IntegrationTestRunner into TB3Runner
3545db2 Added User-Agent and Screen Width + Height labels to portlet test.
c5aaf93 Refactored JSR286 portlet test.
52dcbaa Pressing ESC now closes the DateField popup when using month or year resolutions. (#12317)
e45294f Revert "Preventing premature start of drag due to Chrome move event #13381"

Change-Id: I35e119a6e8e68e226487906af35eaa220f3af16f