Replace Integer with Item class
ArrayListTest#testClone was never run
add testClone
fix unused imports reported by errorprone [RemoveUnusedImports]
backport trivial fix for 8169679 to jdk8 ArrayList.java; then re-enable jdk8 ArrayList sublist tests
Disable ArrayList sublist tests on jdk8
add subList tests
add ArrayListTest (because it was easy enough to do so)
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