Disable CopyOnWriteArrayListTest#testSubListAtomicAdds

Because of recent JSR-166 update, we switched CopyOnWriteArrayList
implementation from the android rewrite to the original version.
original version  fails the
libcore.java.util.concurrent.CopyOnWriteArrayListTest#testSubListAtomicAdds
test. We can either:
- Revert to rewrite of CopyOnWriteArrayList and reimplement missing methods
- Accept that it fails ATM and Fix the issue in the upstream jsr-166

In a meantime, I'm adding the test to knownfailures.txt

Bug: 27673247
Change-Id: Id167ee59dec94c6524fed1f20f754aafc9180670
1 file changed