* Test tweaks
Less fixed waiting times when there are ways to check that the operation
has been performed. This will hopefully improve the stability a bit.
* Merge branch 'master' into updateTests20191218
Replace the screenshot usage in framework test (#11547)
- Replace the GridDisabledTest screenshot usage
- Replace the screenshot tests in BasicCrudGridEditorRowTest
- Replace the screenshot tests in ComboboxVaadinIcons
- Replace the screenshot tests in ValoThemeUITest::accordions
- Added screenshotcomparetolerance to some screenshot test to make tests stable
* Fix TestBench API imports, move functionality from custom elements
* Fixes to TestBench APIs and JavaDocs
* Merge remote-tracking branch 'origin/master' into 578_tbapi_cleanup
* Fix method name in CheckBoxGroupTest
* Remove unused custom element classes
* Implement getOptions using getOptionElements
* Replace setValue with setSelection in CheckBoxGroupElement
* Rename CheckBoxGroupElement getSelection to getValue
* Fix one last method
Move and rename server classes which go into the compatibility package
* Use com.vaadin.v7
* Use the same class name as in Vaadin 7
* Use a "vaadin7-" declarative prefix for Vaadin 7 components
Change-Id: I19a27f3835b18980b91a4f8f9464b2adde1a5fd5