fix #961 Add timeout after focus or blur action, on some tests.

Fix theses tests on IE 11:

test.aria.widgets.form.multiselect.checkFeatures.MultiSelect
test.aria.widgets.form.multiselect.issue223.MultiSelect
test.aria.widgets.form.multiselect.issue312.AutoComplete
test.aria.widgets.form.multiselect.onblur.MultiSelect
test.aria.widgets.form.timefield.checkFormat.TimeField
test.aria.widgets.form.timefield.checkValue.TimeField
test.aria.widgets.form.passwordfield.PasswordField

Close #950