common: Annotate java.util.Iterator

common: Annotate java.util.Iterator

Just add an annotation to forEachRemaining(). The goal is to have
_some_ annotation in there so that the next() method makes use
of the declared type, and we don't get the "this type doesn't
seem designed with null annotations in mind" warning.

Change-Id: Idbd8b9e6e62ddd876f390280edb3d2b46d264602
Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Reviewed-on: https://git.eclipse.org/r/85622
Reviewed-by: Hudson CI
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>