1.8 aria related failures

[haysmark]

I suspect these failures are caused by some of the robot tests being inconsistent with the underlying non-robot tests; we updated these tests in the recent a11y backport. These failures are common to both FF18 and Chrome 24.

    _AssertFailure: assertEqual() failed:
 	expected
		1
	but got
		0

 with hint: 
		date is selected
FAILED test: ../../dijit/tests/robot/Calendar_a11y.html::API::initialValue 0 ms
    Error: Cannot call method 'setAttribute' of undefined
FAILED test: ../../dijit/tests/robot/Calendar_a11y.html::aria:: 6 ms
    _AssertFailure: assertEqual() failed:
 	expected
		0
	but got
		-1

 with hint: 
		actual value is null
FAILED test: ../../dijit/tests/robot/Calendar_a11y.html::navigation::month navigation 4506 ms
     _AssertFailure: assertEqual() failed:
 	expected
		tabpanel
	but got
		null

 with hint: 
		containerNode child role
FAILED test: ../../dijit/tests/layout/robot/TabContainer_a11y.html::aria::tab container attributes 1 ms

[Douglas Hays]

In [30481], add gridNode attach point to _altCalendar template.

[Douglas Hays]

Bill, can you look at the TabContainer? a11y issue? It's probably something to do with layout aria changes not being backported fully to 1.8.

[bill]

Sure, I'll take a look.

[bill]

In [30482]:

Since the StackContainer wrapper changes from [29904] were (intentionally) not backported to 1.8, this part of the test changes from [30053] cannot be backported either, refs #16307, fixes #16631.